Tomato Summer Squash and Caramelized Onion Gratin

Ingredients

• 6 large plum tomatoes, sliced in 1/4 inch slices
• 2 zucchinis, sliced in 1/4 inch slices
• 2 yellow squash, sliced in 1/4 inch slices
• 1 tablespoon extra-virgin olive oil plus more for oiling baking dish
• 1 large sweet onion, sliced
• 2 garlic cloves, minced
• 3/4 cup Parmesan cheese, grated
• 1/4 cup fresh basil, chopped
• sea salt and freshly ground black pepper to taste

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