Rinse and thinly slice summer squash, zucchini and onion.
Mix all the vegetables together.
Form cup shaped containers using heavy duty aluminum foil.
Place about 1 cup of vegetable mix in each cup.
Season to taste with your favorite herbs and spices.
Pinch top of foil cups together. To allow smoke penetration a couple small holes around the top of each vegetable cup.
Place foil cups in smoker at 220°F for 1 hour.