Name: Grilled Zucchini and Yellow Squash with Dijon Marinade Recipe
Prep time: 10 min
Cook time: 6 min
Total time: 20 min
Cuisine: American
Ingredients: 2 medium sized zucchini; 2 medium sized yellow squash; ¼ cup extra-virgin olive oil; 1 Tablespoon Dijon mustard; 1 teaspoon garlic, finely minced; 1 teaspoon dried thyme; ½ teaspoon kosher salt; ¼ teaspoon black pepper; ¼ teaspoon crushed red pepper flakes

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If you’re looking for a fresh, vibrant side dish that’s bursting with flavor, the Grilled Zucchini and Yellow Squash with Dijon Marinade Recipe is an absolute winner. This recipe brings together tender slices of zucchini and yellow squash grilled to perfection, enhanced by a tangy and slightly spicy Dijon-based marinade. Every bite offers a delightful mix of smoky char, zesty mustard, and aromatic herbs, making it a perfect companion to any summer meal or a healthy star on the grill.

Ingredients You'll Need

The image shows a white cutting board on a white marbled surface. There are two yellow squash halves on the left side of the board, each cut lengthwise, showing their pale yellow flesh and seeds inside. On the right side, there are two zucchini halves, also cut lengthwise, displaying their light green flesh and seeds with darker green outer skin. A black-handled knife lies beside the cutting board on a gray and white striped cloth. Photo taken with an iphone --ar 4:5 --v 7

These ingredients are wonderfully simple yet essential for that perfect balance of taste, texture, and color in this dish. Each one plays a role in turning humble squash into a flavor-packed treat.

2 medium sized zucchini: Fresh zucchini provides a mild, tender base with lovely grill marks and a slightly sweet flavor.
2 medium sized yellow squash: Their bright yellow color adds a pop of sunshine and slightly different texture to the mix.
¼ cup extra-virgin olive oil: Helps to create a silky marinade that keeps the vegetables juicy and adds rich mouthfeel.
1 tablespoon Dijon mustard: This gives the marinade a tangy, spicy kick that lifts the entire dish’s flavor profile.
1 teaspoon garlic (finely minced): Garlic infuses aromatic warmth and depth that complements the grilled vegetables beautifully.
1 teaspoon dried thyme: Thyme adds an earthy, herbal note that makes the marinade more complex and inviting.
½ teaspoon kosher salt: Seasoning is key — salt enhances all the flavors without overpowering the natural sweetness.
¼ teaspoon black pepper: Provides gentle heat and a mild bite to balance the mustard’s sharpness.
¼ teaspoon crushed red pepper flakes: Adds a subtle tingling spice that brings everything alive without overwhelming the palate.

How to Make Grilled Zucchini and Yellow Squash with Dijon Marinade Recipe

Two images side by side on a white marbled surface. The left image shows a metal bowl sitting on a light brown textured cloth, containing a thick, grainy mixture with a yellowish color and bits of red and dark spices. A whisk with a light wooden handle rests nearby on the surface. The right image shows a clear glass bowl with sliced yellow and green zucchini coated with a similar grainy sauce speckled with herbs and spices. A white cloth is lightly visible under the bowl. Photo taken with an iphone --ar 4:5 --v 7

Step 1: Prepare Your Squash

Start by washing the zucchini and yellow squash thoroughly. Next, slice them lengthwise into pieces ranging between ¼ and ½ inch thick. This thickness ensures they cook evenly on the grill, achieving a tender interior with just the right amount of grilling char.

Step 2: Whip Up the Marinade

In a bowl, whisk together the extra-virgin olive oil, Dijon mustard, finely minced garlic, dried thyme, kosher salt, black pepper, and crushed red pepper flakes. This marinade is your flavor powerhouse — tangy, fragrant, and with a touch of heat.

Step 3: Marinate the Vegetables

Place your zucchini and yellow squash slices in a large bowl and gently toss them in the marinade until each slice is beautifully coated. Let them sit for about 15 minutes while your grill preheats. This resting time allows the flavors to deeply soak in, ensuring each bite bursts with zest.

Step 4: Preheat the Grill

Set your grill to medium heat, aiming for about 400 to 450 degrees Fahrenheit. This temperature is just right for getting those appealing grill marks and caramelizing the squash without drying them out.

Step 5: Grill to Perfection

Before placing the slices on the grill, shake off the excess marinade but don’t throw it away—you'll use it later. Lay the squash perpendicular to the grill grates to prevent them from slipping through. Grill each side for 2 to 3 minutes, keeping the lid open to avoid steaming and to get that glorious char. This step transforms the squash into tender, smoky, and irresistibly tasty pieces.

Step 6: Finish and Serve

Once off the grill, arrange the vegetables on a serving platter and drizzle with the reserved marinade for an extra flavor boost. Taste and adjust salt if needed, and consider throwing on some fresh herbs for a fragrant finishing touch.

How to Serve Grilled Zucchini and Yellow Squash with Dijon Marinade Recipe

Garnishes

Fresh herbs like parsley, basil, or oregano add a vibrant green contrast and a burst of freshness. A sprinkle of crumbled feta or shaved Parmesan can bring a delightful creaminess that pairs beautifully with the mustard marinade.

Side Dishes

This dish shines alongside grilled chicken, fish, or steak, making it a versatile addition to any barbecue spread. For a vegetarian meal, serve it with quinoa, couscous, or a hearty bean salad to round out the flavors and textures.

Creative Ways to Present

For a colorful salad, toss the grilled squash with cherry tomatoes, olives, and a splash of balsamic vinegar. Alternatively, layer the slices between toasted bread with goat cheese for a delicious veggie sandwich or serve atop warm polenta for a comforting treat.

Make Ahead and Storage

Storing Leftovers

Grilled zucchini and yellow squash store wonderfully in an airtight container in the refrigerator. They keep well for up to 3 days, making them the perfect make-ahead side or snack to enjoy throughout the week.

Freezing

Because of their high water content, these grilled vegetables do not freeze well—freezing can cause them to become mushy upon thawing. It’s best to enjoy this recipe fresh for maximum texture and flavor.

Reheating

To reheat, gently warm the leftovers in a skillet over medium heat for a few minutes to maintain their texture without softening too much. Avoid the microwave if you want to preserve that lovely grilled char and bite.

FAQs

Can I use other types of squash for the marinade?

Absolutely! While zucchini and yellow squash work best for their texture and flavor, you can experiment with pattypan or even eggplant slices. Just keep the thickness consistent for even grilling.

Is it possible to make this recipe vegan?

The recipe is naturally vegan already since it uses vegetable-based ingredients. Just be sure to skip any cheese garnishes if you add them when serving.

How long can the squash marinate?

While 15 minutes is ideal, you can let the squash soak in the marinade for up to 30 minutes. Just avoid going too long or the acidity might start to soften the vegetables too much.

Can I make this recipe indoors on a grill pan?

Yes! A grill pan on the stovetop works well—just cook over medium-high heat and watch carefully to get those lovely marks without overcooking.

What is the best way to prevent the squash from sticking to the grill?

Make sure your grill is preheated properly, and brush or spray the grates with oil before adding the squash. Also, shaking off excess marinade helps reduce sticking.

Final Thoughts

There’s something so satisfying about the mix of smoky grill flavor and tangy Dijon in this Grilled Zucchini and Yellow Squash with Dijon Marinade Recipe. It’s simple, quick, and utterly delicious, guaranteed to become your go-to side on warm days. Give it a try at your next cookout or family dinner—you might just find it stealing the show!

Ingredients You'll Need