Preheat grill medium heat. Line your terrine or bread pan with foil. Spray the foil with cooking spray.
Next, spray two to three aluminium tins with cooking spray, or brush with olive oil to prevent the veggies from sticking. You can also use aluminum foil if you don’t have trays.
Lay the onions and bell peppers in one tray and the mushrooms, zucchini and eggplant in another tray. Lightly brush the veggies with olive oil on both sides and season with salt, pepper, and lemon pepper (or your favorite seasoning).
Cook the veggies on the barbecue until they are al dente. If you want to give them some color and grill stripes, lay them directly on the grill for the last few minutes.
Onions take the longest to cook, followed by bell peppers, eggplant, zucchini and mushrooms. Since no two grills seems to cook the exact same, you may have to adjust these times and the grill temp, but in general cook each veggie for the following amount of time:Red Onions: 5-6 minutes per sideRed Bell Peppers: 3-4 minutes per sideEggplant: 3-4 minutes per sideZucchini: 2-3 minutes per sideMushrooms 2-3 minutes per side Once the veggies are cooked, stack the veggies in the prepared terrine or loaf pan, preferably starting with the veggies you’d like to see on top when you serve it, at the bottom of the pan, because it’s easier to get the terrine out of the dish by inverting it on a platter. Lay the cheese in between whichever layer of veggies you want to. Sprinkle basil intermittently throughout the layers. Press down on the top of the entire terrine with your hands to slightly compress the layers. Cover the terrine with the lid or with foil. Place heavy cans of beans or tomato sauce on top to help pack down the veggies. Refrigerate until ready to heat and serve. Can refrigerate for several days ahead of time.
When ready to bake, preheat oven to 350 and bake the terrine, covered for about 25 minutes or until heated through. Remove from oven and allow to sit for 10-15 minutes.
Invert onto your serving platter and discard the foil. Garnish with a sprig of oregano or parsley. Slice into 1 1/2-inch slices and serve.