COOK IT.
Set your Louisiana Grills grill to 375°F and allow to preheat.
Slice the tomatoes, squash, and zucchini into uniform slices of an 1/8 of an inch – About the thickness of a poker chip. Slice the mushrooms and set aside.
For the sauce – In some olive oil, sauté the onion and bell peppers until soft – 5 or 6 minutes. Add the garlic last as you sauté, about a minute before the peppers are done. Add the can of tomatoes and mix through. Remove from the heat and set aside.
Arrange the sliced vegetables over the sauce in the cast iron pan, in a circular pattern, starting from the outside and working toward the center. Top these with the sliced mushrooms, and then drizzle the olive oil over the top.
Cover the cast iron pan with foil and put in your Louisiana Grills grill for 40 minutes covered. After 40 minutes, remove the foil, and cook uncovered for an additional 30 minutes.
Once finished remove the entire cast iron pan containing the ratatouille from your grill and serve hot.