Upside-Down Tomato Tart

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2 tablespoons bacon drippings

4 cups heirloom cherry tomatoes

1/2 large sweet onion, sliced into thin half-moons

1/2 teaspoon lemon pepper seasoning

1/4 teaspoon red pepper flakes

Kosher salt and freshly ground pepper

Cooking spray

Juice of 1/2 lemon

1/2 cup grated asiago cheese

1 9-inch-square piece frozen puff pastry (half of a 17-ounce package), thawed

Chopped fresh basil, for topping