This grilled veggie platter is a vibrant, smoky side dish that turns simple summer produce into the star of your meal. A mix of zucchini, bell peppers, red onion, and mushrooms is tossed in a simple herb marinade, grilled until tender and charred, then finished with a bright balsamic glaze. It works because the high, direct heat of the grill caramelizes the natural sugars in the vegetables, giving them a deep, savory flavor that you just can’t get from roasting or sautéing.
Ingredients
- 2 medium zucchini (about 1 lb / 450 g), sliced into 1/2-inch (1.25 cm) rounds
- 2 medium yellow squash (about 1 lb / 450 g), sliced into 1/2-inch (1.25 cm) rounds
- 1 large red bell pepper (about 8 oz / 225 g), cored and cut into 2-inch (5 cm) wide strips
- 1 large yellow bell pepper (about 8 oz / 225 g), cored and cut into 2-inch (5 cm) wide strips
- 1 large red onion (about 10 oz / 280 g), cut into 1/2-inch (1.25 cm) thick rings
- 8 oz (225 g) cremini mushrooms, stems trimmed
- 3 tbsp (45 ml) olive oil
- 2 tbsp (30 ml) balsamic vinegar
- 2 cloves garlic, minced
- 1 tsp (5 g) dried oregano
- 1/2 tsp (3 g) salt
- 1/4 tsp (1 g) black pepper
- 2 tbsp (30 ml) balsamic glaze (store-bought or homemade, see Tips)
- 2 tbsp (8 g) fresh basil, thinly sliced (for garnish)
Instructions
- Preheat a gas or charcoal grill to medium-high heat (about 400°F / 200°C). If using a charcoal grill, wait until the coals are covered with white ash.
- In a large bowl, whisk together the olive oil, balsamic vinegar, minced garlic, oregano, salt, and black pepper.
- Add the zucchini, yellow squash, bell peppers, red onion, and mushrooms to the bowl. Toss gently with your hands or tongs until all vegetables are evenly coated with the marinade.
- Place the vegetables directly on the grill grate. Arrange them in a single layer, leaving a little space between pieces so they char rather than steam. You may need to work in batches if your grill is small.
- Grill the vegetables for 4-6 minutes per side, flipping once with tongs, until they are tender and have nice grill marks. The zucchini and squash should be easily pierced with a fork, and the peppers should be slightly softened but still have some bite. Total grilling time is about 8-12 minutes.
- Transfer the grilled vegetables to a large serving platter. Drizzle with the balsamic glaze and sprinkle with fresh basil. Serve immediately.
Tips
- Cut vegetables uniformly: Slice zucchini, squash, and onion to the same thickness so they cook at the same rate. Thinner slices will cook faster and may burn before the thicker ones are done.
- Don’t overcrowd the grill: If you pile too many vegetables on at once, they will steam and turn mushy instead of getting those beautiful char marks. Grill in batches if needed.
- Make your own balsamic glaze: To make a quick glaze, simmer 1/2 cup (120 ml) balsamic vinegar in a small saucepan over medium-low heat until it reduces to about 2 tablespoons (30 ml), which takes about 10-15 minutes. Let it cool slightly before drizzling.
- Use a grill basket for small pieces: If you’re grilling smaller vegetables like cherry tomatoes or sliced mushrooms, a grill basket or a piece of aluminum foil with holes poked in it will prevent them from falling through the grates.
Serving Suggestions
This platter is incredibly versatile. Serve it as a side dish alongside grilled chicken, steak, or fish. It also makes a fantastic topping for salads, a filling for wraps or sandwiches, or a colorful addition to a summer pasta dish. For a vegetarian main course, serve it over quinoa or with a side of crusty bread and hummus.
Variations
- Add other vegetables: Asparagus, eggplant, corn on the cob (cut into rounds), or halved cherry tomatoes all grill beautifully. Adjust cooking times as needed—asparagus takes about 3-4 minutes, while eggplant may need 5-6 minutes per side.
- Change the marinade: Swap the balsamic vinegar for lemon juice and add a teaspoon of lemon zest for a brighter flavor. Or, use soy sauce, sesame oil, and a pinch of red pepper flakes for an Asian-inspired twist.
- Add cheese: Crumble feta or goat cheese over the hot vegetables right before serving. The slight tanginess pairs perfectly with the smoky char.
- Make it spicy: Add a pinch of cayenne pepper or a finely minced jalapeño to the marinade for a kick of heat.
Storage and Reheating
Store any leftover grilled vegetables in an airtight container in the refrigerator for up to 3-4 days. To reheat, place them on a baking sheet and warm in a 350°F (175°C) oven for 5-7 minutes, or sauté them in a hot skillet for a couple of minutes. You can also enjoy them cold straight from the fridge—they make a great addition to a grain bowl or salad. Avoid microwaving, as it can make the vegetables soggy.
Frequently Asked Questions
Can I use frozen vegetables? Frozen vegetables are not ideal for grilling because they release a lot of water as they thaw, which will prevent them from charring. If you must use them, thaw and pat them very dry before marinating, and grill them in a grill basket.
How do I keep the vegetables from sticking to the grill? Make sure your grill grates are clean and well-oiled. Before preheating, use a paper towel dipped in vegetable oil and held with tongs to rub the grates. Also, ensure your vegetables are coated with oil in the marinade—this helps them release easily.
What if I don’t have a grill? You can achieve a similar result using a grill pan on your stovetop over medium-high heat, or by roasting the vegetables in a 450°F (230°C) oven for 15-20 minutes, flipping halfway through. The char won’t be as pronounced, but the flavor will still be delicious.
Can I prepare the vegetables ahead of time? Yes, you can slice the vegetables and mix the marinade up to 24 hours in advance. Store them separately in the refrigerator, then toss them together right before grilling. Do not marinate for more than 2 hours, as the acid in the vinegar can make the vegetables mushy.
Why are my grilled vegetables bitter? Bitterness can come from overcooking or from burned marinade. The sugars in the balsamic vinegar and the vegetables themselves can burn and turn bitter if the heat is too high or if you leave them on too long. Keep a close eye on them and flip when they have nice grill marks, not when they look blackened.
Is it safe to use the same marinade as a sauce? No, if the marinade has come into contact with raw vegetables, it’s safe to use as a sauce since vegetables are not a common source of foodborne illness. However, if you are grilling meat alongside, do not reuse the marinade from the meat on the vegetables unless you boil it first.
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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes
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