Cut vegetables the long way. Sprinkle vegetables with salt and pepper. Grill the vegetables until al dente and cool. - 2 minutes for zucchini and squash) 4 -5 minutes for the eggplant.
Preheat oven to 350° F.
In an oven-safe pan, arrange the eggplant slices next to each other. Making sure to try and cover up any possible holes there may be. Top with 1 ounce of the tomato sauce and 1/3 of the cheese. Repeat this with the zucchini and summer squash. Top with the garlic, basil and red pepper flakes.
Cover with aluminum foil and bake until cheese is melted and the lasagna is heated all the way through (about 35 minutes). Let sit for 5-10 minutes and serve.Makes 4 Source: