Heart Healthy Summer Squash and Tomato Salad

(5.0)
By Judy Capodanno
Updated 12/9/2025
Dietitian Reviewed: Jane Schwartz, RDN, CLT
Approved for These Diets:
Heart Healthy | Gluten Free | Diabetic | Vegan | Vegetarian
Heart Healthy Squash and Tomato Salad
Photo Credit: iStock

This vibrantly delicious salad makes a light and refreshing forkful you won’t forget. Featuring fresh summer squash, zucchini, and wedged tomatoes sautéed with heart-healthy olive oil and aromatics, it is an excellent way to boost your vegetable intake while keeping saturated fat and sodium low. Best of all, this warm vegetable dish comes together in less than 20 minutes total, making it a perfect side dish for busy weeknights. 

Total Time
20 minutes
Servings
4
Calories
30

What Makes This Heart Healthy Summer Squash and Tomato Salad Healthy

This recipe is a stellar choice for a heart-healthy diet because it focuses on nutrient density and naturally low-sodium ingredients like fresh vegetables. The colorful squash and tomatoes are rich in antioxidants, while the use of a small amount of olive oil provides essential monounsaturated (heart-healthy) fats.

Key Health Highlights

  • Low in saturated fat and cholesterol
  • High in antioxidants from tomatoes and colorful squash
  • Diabetic-friendly due to low sugar and carbohydrate content
  • Provides a good source of fiber, which supports heart and digestive health

FAQs About Heart Healthy Summer Squash and Tomato Salad

Yes, absolutely! Squash and tomatoes are a classic pairing, especially in summer cooking, as the slight sweetness and acidity of tomatoes complement the squash's mild flavor.

This salad is best served fresh (warm or at room temperature). While you can make it a few hours ahead, be aware that the tomatoes and sautéed squash may release water as they sit, which can make the salad slightly soggy the next day.

Store leftovers in an airtight container in the refrigerator for up to 2–3 days. If possible, drain any excess liquid before serving again to refresh the texture.

You should avoid eating yellow squash if it appears obviously spoiled, has a distinct bitter taste, or smells unpleasant. A bitter taste, called cucurbitacin toxicity, is rare but indicates the squash should be discarded.

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What to Serve With This Heart Healthy Summer Squash and Tomato Salad

This light salad pairs perfectly with lean protein mains to create a balanced meal:

Ingredients

Recipe yields 4 servings

Directions

  1. In a medium skillet, heat oil over medium heat. Add summer squash, zucchini, onion and water and cook, covered, for 6 to 8 minutes, or until squash is tender. Reduce heat to low and add remaining ingredients. Cook for 3 minutes, stirring occasionally, or until heated through.

Nutrition Facts

Serving Size:
1/2 cup

30
Calories
1
g
Fat
0
mg
Cholesterol
6
mg
Sodium
5
g
Carbs
0
g
Sat. Fat
1
g
Fiber
1
g
Protein

Alternative Cooking & Preparation Methods

If you prefer a hands-off approach, you can easily roast the vegetables instead of sautéing them, or serve this as a raw, marinated salad.

  • Roasting: Preheat the oven to 400°F (200°C). Toss the squash, zucchini, and onion with olive oil, salt, and pepper on a baking sheet. Roast for 10–15 minutes, or until tender. Once roasted, stir in the tomatoes, garlic, and oregano, and serve warm. This method slightly caramelizes the squash for a deeper flavor.
  • Raw and Marinated: Instead of cooking, slice the squash and zucchini paper-thin, marinate them with the olive oil, garlic, balsamic vinegar, and herbs for 15 minutes, and then mix with the tomatoes for a fresh, raw salad.
  • Protein Boost: Stir in a half cup of cooked, rinsed chickpeas or white beans to transform this side dish into a light, fiber-rich lunch.
  • Add Crunch: Sprinkle toasted pine nuts, walnuts, or pepitas on top just before serving for added heart-healthy fat and texture.

Serving & Storage Tips

  • Serving: This salad is versatile and can be served warm, immediately after cooking, or chilled to room temperature for a lighter side. Garnish with a sprinkle of fresh basil or parsley for a burst of color and flavor.
  • Storage: Store any leftovers in an airtight container in the refrigerator for up to three days. The squash may become softer over time.
  • Make-Ahead: For best results, prepare the vegetables (chop the squash and slice the onion) ahead of time, but do not cook until you are ready to serve to maintain the best texture.

Ingredient Substitutions

You can substitute other firm, quick-cooking vegetables like diced bell peppers (red or yellow) or mushrooms.

If you need to vary the flavor, avocado oil is a good heart-healthy alternative with a neutral taste. You can also slightly reduce the oil if you are strictly limiting fat.

Substitute with a mixture of dried Italian herbs, or add fresh herbs like basil, thyme, or marjoram during the last minute of cooking for a brighter flavor profile.

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