Grilled Vegetable Foil Packs with Herb Butter
Sheet pan grilling at its easiest: fresh corn, potatoes, carrots, zucchini, and onions tossed with melted butter, Dijon mustard, and thyme, then sealed in foil packets for hands-off cooking. The vegetables steam in their own juices, emerging tender and infused with mustard tang and herbal notes. Perfect for summer cookouts, weeknight dinners, or feeding a crowd without hovering over the grill. This no-fuss method keeps vegetables moist while developing gentle char where foil edges expose them to heat.
Ingredients
- 2 ear fresh sweet corn, husks removed, each cut into 4 pieces
- 4 small red potatoes (new), about 1/2 lb., each cut in half
- 2 medium carrots, cut diagonally into 1 to 1 1/4-inch chunks
- 1 medium zucchini, cut into 1-inch chunks
- 1 medium onion, cut into thin wedges
- ¼ cup butter, melted
- 2 tablespoon Dijon mustard
- ½ teaspoon dried thyme leaves
- ¼ teaspoon salt
- ¼ teaspoon pepper
Instructions
- 1
Heat grill to medium.
- 2
Combine corn, potatoes, carrots, zucchini, and onion in a large bowl.
- 3
Whisk together melted butter, Dijon mustard, dried thyme, salt, and pepper in a small bowl.
- 4
Pour butter mixture over vegetables and toss to coat.
- 5
Cut four 18x12-inch pieces of heavy-duty foil.
- 6
Divide vegetable mixture evenly onto the center of each foil piece.
- 7
Wrap each packet securely using double-fold seals, leaving room for heat expansion.
- 8
Place packets seam side up on grill over medium heat.
- 9
Cook until vegetables are tender, 25 to 35 minutes.
- 10
Open packets carefully, allowing steam to escape before serving.
Tips
Use heavy-duty foil, not regular; regular foil tears on the grill and defeats the packet method.
Double-fold seams traps steam effectively. Leave 1 to 2 inches of room at the top for expansion to prevent bursting.
Open packets away from your face; the released steam is very hot and can cause burns.
Good to Know
Cooked packets keep refrigerated in an airtight container up to 2 days. Reheat gently on the grill wrapped in foil, or unwrap and warm in a skillet over medium heat.
Prepare foil packets up to 4 hours ahead; store in the refrigerator. Grill just before serving for best texture. Do not freeze prepared raw packets; moisture breakdown affects vegetable texture.
Open packets at the table for a dramatic presentation. Serve as a side to grilled meats, fish, or tofu. Works well for picnics, camping, and large gatherings where individual packets reduce serving logistics.
Common Mistakes
Use regular foil to avoid tearing and losing steam seal.
Forget to leave room for heat expansion to avoid bursting packets.
Overcrowd foil packets to ensure even heat circulation and tender vegetables.
Neglect to place packets seam side up to prevent butter from leaking out the bottom.
Substitutions
Dairy-Free Swaps
General Alternatives
FAQ
Can I make these packets ahead and freeze them?
Raw packets do not freeze well; vegetable cells break down during thawing, leading to mushy texture. Prepare packets up to 4 hours ahead and refrigerate instead, grilling just before serving.
What if I don't have heavy-duty foil?
Layer regular foil in double or triple thickness to prevent tearing. Heavy-duty foil is sturdier and less prone to puncture, so doubling thinner foil mimics its strength and ensures steam containment.
How long can I store leftover cooked packets?
Keep opened packets in an airtight container in the refrigerator up to 2 days. Reheat on the grill wrapped in foil, or unwrap and warm in a skillet over medium heat until heated through.