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Grilled Zucchini and Squash in Dijon Marinade

Grilled zucchini and squash in a tangy Dijon marinade for char-marked planks with a glossy, caramelized coating. Quick grill timing keeps the vegetables tender-crisp while the reserved Dijon sauce turns golden in the last minute.
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Prep Time 10 minutes
Cook Time 10 minutes
marinating 30 minutes
Total Time 50 minutes
Servings: 4 servings
Course: Side Dish
Cuisine: French-American
Calories: 190
Ingredients Equipment Method Notes

Ingredients
  

Zucchini and yellow squash
  • 2 medium zucchini sliced into 1/3-inch diagonal planks
  • 2 medium yellow squash sliced into 1/3-inch diagonal planks
Dijon marinade
  • 3 tbsp olive oil
  • 2 tbsp Dijon mustard
  • 1 tbsp whole grain mustard
  • 2 tbsp white wine vinegar
  • 2 cloves garlic minced
  • 1 tsp fresh thyme
  • 1 tsp honey
  • 0.25 salt and black pepper to taste; adjust to preference
  • 0.25 black pepper and salt to taste; adjust to preference
Serving
  • 1 fresh thyme
  • 1 lemon

Equipment

  • 1 grill

Method
 

Make the Dijon marinade
  1. Whisk olive oil, Dijon mustard, whole grain mustard, white wine vinegar, minced garlic, fresh thyme, honey, salt, and black pepper together until smooth.
  2. Toss zucchini and yellow squash planks in the marinade, then let sit 30 minutes to marinate (cover if possible).
Grill and caramelize
  1. Preheat the grill to medium-high and oil the grates so the vegetables don’t stick.
  2. Remove vegetables from the marinade, reserve the remaining marinade, and grill for 3–4 minutes per side until caramelized with visible char marks.
  3. In the last minute of cooking, brush the vegetables with the reserved marinade so it turns glossy and golden.
  4. Arrange on a platter, drizzle any remaining marinade over, garnish with fresh thyme, and serve with lemon.

Notes

For the most even char, keep planks close to 1/3-inch thick and don’t crowd the grill. Refrigerate leftovers up to 3 days; reheat briefly, or serve cold. Freezing is not recommended as the zucchini and squash can soften. For a lower-sugar option, reduce honey to 1/2 teaspoon or substitute with a sugar-free honey-style sweetener if you prefer.