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How to Grill Summer Vegetables (Eggplant, Zucchini, Peppers & More)

A platter of char-grilled eggplant, zucchini and peppers

Written by: Amy Larsen

Amy Larsen spent 25 years as a marketing executive helping mutiple industries develop growth strategies - including Food & Beverage. A health scare changed how she thought about food. She founded Butter & Sage Market to rebuild the connection between local food makers and the communities around them. She lives in Round Rock, TX.

Published: July 26, 2026

There's a moment in late summer when your counter is covered in vegetables and the last thing you want to do is turn on the oven. This is what the grill is for. A little char transforms August's zucchini, eggplant, peppers, and onions from "I should really use these up" into the thing everyone reaches for first. And it's genuinely hard to mess up once you know a few basics.

Prep: Cut for the Grill, Not the Pan

The goal is pieces big enough that they won't fall through the grates and flat enough to get real contact with the grill. Slice zucchini and eggplant lengthwise into planks about half an inch thick. Quarter peppers and pull out the seeds so they lie flat. Cut onions into thick rounds and, if you can, run a skewer through them so they don't come apart when you flip. Everything gets tossed with olive oil and a good pinch of salt — the oil carries the heat and helps you get those beautiful grill marks.

One tip that makes eggplant especially great: salt the planks and let them sit for ten minutes before grilling. It draws out a little moisture so they grill up silky instead of spongy.

Heat and Timing: Medium-High and Don't Fuss

Get your grill to medium-high — hot enough to sear, not so hot that the outside burns before the inside softens. Lay the vegetables down and then leave them alone. The most common mistake is flipping too soon and too often; give each side a few minutes of undisturbed contact to build char and release cleanly from the grate. Zucchini and peppers cook fast, in about three to four minutes a side. Eggplant and thick onion take a touch longer. You're looking for deep grill marks and a tender center.

Finish and Use It All Week

Grilled vegetables get better with a finishing touch while they're still warm. A squeeze of lemon, a drizzle of good olive oil, a scatter of fresh herbs or crumbled feta, a splash of balsamic — any of these takes them over the top. Pile them on a platter and they're a side dish; layer them on grilled bread with ricotta and they're lunch; chop the leftovers into pasta, grain bowls, or an omelet and you've got dinner for days.

That's the real gift of grilling your market haul: it works ahead. Grill a big batch on Sunday, and you've turned a pile of summer vegetables into the easiest, smokiest meals of the week.

What's your favorite thing to throw on the grill this time of year? Come trade ideas with the community.

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