Heat grill to medium-high. Place ingredients in a large mixing bowl or zip-top bag and toss well to combine. Make a double layer (18 inches long) of aluminum foil and place half the vegetable mix in a horizontal strip along the middle. Bring top edges together and crimp to seal, then crimp ends to seal. Wrap with a third layer of foil and seal well.
Repeat with remaining ingredients. Put packets side by side directly on hot coals about 30 minutes, turning every 8 to 10 minutes.
Remove from heat and let sit 10 minutes. Carefully open packets and serve.
This camping favorite works well with any live fire or can easily go into a hot oven. Work with your favorite combination of vegetables and herbs – just think about textures and cooking times. Peppers, onions, and potatoes work well together; while the spuds take more time, the peppers and onions just get sweeter and mellower. If you’ve got leftovers, this mix (along with some steak) makes a great salad or sandwich.