Zucchini and Yellow Squash Soup with Rosemary and Parmesan (Pressure Cooker or Stovetop)

Zucchini and Yellow Squash Soup with Rosemary and Parmesan is perfect to welcome the arrival of fall, and this tasty soup can be made in the Instant Pot or on the stove! And it’s low-carb, Keto, low-glycemic, meatless, gluten-free, and South Beach Diet Phase One. Use the Diet-Type Index to find more recipes like this one.

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Zucchini and Yellow Squash Soup with Rosemary and Parmesan (Pressure Cooker or Stovetop) found on KalynsKitchen.com

This delicious Zucchini and Yellow Squash Soup with Rosemary and Parmesan is a recipe that has a lot of sentimental value for me.  I first made it in 2008 when Lisa of Homesick Texan sent me the link to this recipe on Epicurious.com and told me how delicious it was.  And I was making soup back then because I had just gotten braces on my teeth!

Now flash forward six years and I’m still enjoying this Zucchini Soup with my nice straight teeth.  Things have changed in six years though, and now I’m building up a collection of Pressure Cooker Recipes on the blog and I’d pull out my beloved Cuisinart Electric Pressure Cooker or my Instant Pot to make the soup more quickly.  Not to worry though, if you don’t have a pressure cooker you can easily make this soup on the stove.  It’s still zucchini and summer squash season for a few more weeks, and I think using those summer veggies in a soup is a perfect way to transition into fall (which arrives tomorrow, sob!)

This delicious soup can be made with chicken stock or vegetarian broth, so take your choice on that!

Zucchini and Yellow Squash Soup with Rosemary and Parmesan (Pressure Cooker or Stovetop) found on KalynsKitchen.com

Chop up an onion, finely chop the rosemary, and mince up a tablespoon of fresh garlic.  (You can use dried or frozen rosemary if you don’t have fresh, but be sure to chop it very small so you don’t bite into a big piece of rosemary. And of course fresh herbs are always best!) Turn the pressure cooker to Saute (or medium-high heat for a stovetop pressure cooker or soup pot.)  Add the olive oil and butter and heat until butter is melted and the pan is hot, then add the onion and cook 3-4 minutes. Then add the finely chopped rosemary, minced garlic, and Italian Herb Blend and cook about 3-5 minutes more.

Add the chicken or vegetable stock and let it simmer for about 10 minutes, long enough to get the onion/garlic/rosemary flavors into the stock.)  Be sure to use the reduced amount of stock if you’re using a pressure cooker. I kept the pressure cooker setting on Saute for this, but on the stove I’d reduce the heat to medium. While the stock simmers, chop up the zucchini and yellow squash until you have about 8 cups of diced squash (or slightly less if your pressure cooker won’t hold that much.) In the pressure cooker, add the squash, lock the lid in place, choose MANUAL, HIGH PRESSURE  and set the time for 5 minutes. The use quick release method to release the pressure. (On the stove add the squash and simmer over medium-low or low heat about 30 minutes, or until the squash is very soft and the flavors are well blended.)

Here’s how my squash looked after 5 minutes at high pressure. Then I used my Immersion Blender to puree the soup. You could do this in a food processor or blender if you don’t have an immersion blender, but be careful with the hot liquid. (Use the same process to puree the stovetop soup after it’s cooked for about 30 minutes.) Then you’ll need to simmer the soup to reduce it until it’s as thick as you’d like, probably about 20 minutes on the stovetop or in the pressure cooker.  (I simmered on Saute so it cooked down more quickly.)  Here’s how my soup looked after it has been reduced.  Season to taste with salt and fresh-ground black pepper and serve hot, with plenty of freshly-grated Parmesan to add at the table.

Zucchini and Yellow Squash Soup with Rosemary and Parmesan (Pressure Cooker or Stovetop) found on KalynsKitchen.com

More Soup for Dinner:

The BEST Low-Carb Instant Pot Soup Recipes ~ Kalyn’s Kitchen
Seven Zucchini Soup Recipes ~ Soup Chick
Italian Sausage, Zucchini and Macaroni Soup ~ Kalyn’s Kitchen
50 AMAZING Low-Carb Instant Pot Soup Recipes ~ Slow Cooker or Pressure Cooker

Weekend Food Prep:

This recipe has been added to a new category called Weekend Food Prep  to help you find recipes you can prep or cook on the weekend and eat during the week!

Zucchini and Yellow Squash Soup with Rosemary and Parmesan (Pressure Cooker or Stovetop)

Zucchini and Yellow Squash Soup with Rosemary and Parmesan is perfect to welcome the arrival of fall.

Ingredients:

  • 2 T olive oil
  • 1 T butter (or use more olive oil if you don’t want butter)
  • 1 yellow onion, chopped
  • 1 T minced fresh garlic
  • 1 tsp. Italian Herb Blend
  • 4 tsp. chopped fresh rosemary or frozen rosemary (or can use 2 tsp. finely chopped dried rosemary, but fresh or frozen rosemary will be much better)
  • 3 lb. diced green and yellow summer squash (about 8 cups diced squash or slightly less if you can’t fit that much in your pressure cooker, can also use all green or all yellow squash)
  • 6 or 8 cups vegetable stock or chicken stock
  • salt and fresh-ground black pepper to taste
  • fresh grated Parmesan cheese, for serving

Directions:

  1. Chop the onion, mince the garlic, and finely chop the fresh rosemary.
  2. Heat olive oil and butter in large heavy soup pot or stovetop pressure cooker (or in the bottom of the electric pressure cooker on the Saute setting).
  3. Then add onion and saute about 5 minutes, or until onion is translucent and softened.
  4. Add garlic, rosemary, and Italian Herb Blend and cook 3-5 minutes more.
  5. While the onion, garlic, and rosemary are cooking, chop up enough zucchini and yellow squash to make 8 cups (or slightly less for the electric pressure cooker if you can’t fit that much.)
  6. Add the vegetable or chicken stock to onion mixture and simmer 10 minutes.  (Use 6 cups stock for pressure cooker or 8 cups for stovetop.)
  7. For the electric pressure cooker I kept the setting on Saute to simmer the stock.)
  8. Then add chopped zucchini and yellow squash.
  9. For stovetop cooking,  turn heat to very low and simmer 30 minutes, or until squash is very soft and flavors are well blended.
  10. For electric or stovetop pressure cooker, lock the lid, choose MANUAL, HIGH PRESSURE and set the time for 5 minutes.
  11. Use the quick-release method to release the pressure after the time is up.
  12. Use an Immersion Blender to puree the mixture, or work in batches and puree in food processor or blender. (Be careful if you’re using the blender or food processor and don’t fill them too full when blending hot liquids.)
  13. When mixture is as pureed as you’d like it, check the consistency of the soup.
  14. Simmer until the soup is reduced and as thick as you’d like it.  (Simmer about 20 minutes on medium low on the stovetop or stovetop pressure cooker or about 20 minutes on Saute in the electric pressure cooker.
  15. This time may vary, depending on how thick you want it.)
  16. Season to taste with salt and fresh-ground black pepper.
  17. Serve soup hot, with freshly grated Parmesan cheese sprinkled on top if desired.

Notes:

I love Italian Herb Blend from The Spice House, but most brands are similar. How to make frozen rosemary.

I use my own homemade chicken stock; use 6 cups for pressure cooker or 8 cups for stovetop.

Adapting recipe amounts to use the Cuisinart Electric Pressure Cooker:
I used 6 cups of stock and slightly less than 8 cups of diced squash to make this in my electric pressure cooker.  All other ingredients are the same.

Equipment:
I used the Cuisinart Electric Pressure Cooker for this soup, but you can definitely make it in the Instant Pot or a stovetop pressure cooker if that’s what you have.

Recipe inspired by soup recipe from Epicurious.com.

All images and text ©

Low-Carb Diet / Low-Glycemic Diet / South Beach Diet Suggestions:
Everything used here is a low-glycemic and low-carb ingredient, making this soup great for any low-glycemic or low-carb eating plan. I eliminated potatoes from the soup to make it low in carbs and better for the South Beach Diet. I did use a little butter here for flavor; if you’re following South Beach you could replace the butter with more olive oil if you wish.

Find More Recipes Like This One:
Use the Recipes by Diet Type photo index pages to find more recipes suitable for a specific eating plan. You can also Follow Kalyn’s Kitchen on Pinterest to see all the good recipes I’m sharing there.

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Zucchini and Yellow Squash Soup with Rosemary and Parmesan (Pressure Cooker or Stovetop) found on KalynsKitchen.com