Start with the sauce; put a few tablespoons of olive oil in a 12″ cast iron (I use Stargazer Cast Iron [use SLOTHSTAR2 for 10% off!]). Saute onions, bell peppers, and garlic until soft. Usually 5-6 minutes. Add crushed tomatoes, salt and pepper to taste, and basil. Remove from heat and set aside.
Slice the veggies! I use a mandoline on the 3mm setting for slicing the squash and eggplants and a knife for the tomatoes. Slice eggplants, zucchini, and yellow squash at 3mm and set aside. Arrange the veggies in a pattern and place them in the sauce we made in the cast iron. It is easiest to start on the outer edge of the cast iron and work your way towards the center.
Before covering with foil and placing in the smoker, I mix basil, parsley, thyme, garlic, olive oil, and a pinch of salt in a food processor and mix until smooth. Spread this over the dish.
Cover with foil and place on the smoker for 40 minutes at 375 degrees. At 40 minutes, remove foil and allow to finish on the smoker for 20 more minutes to absorb the delicious smoke flavor.