Pat's Grilled Vegetable Hero

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1 pint cherry tomatoes, halved

1 medium red onion, cut into 1/2-inch rings

1 yellow bell pepper, quartered, seeds and ribs removed

1 red bell pepper, quartered, seeds and ribs removed

1 summer squash, sliced on the bias into 1/2-inch pieces

1 zucchini squash, sliced on the bias into 1/2-inch pieces

1/4 cup extra-virgin olive oil

Kosher salt and freshly ground black pepper

1 teaspoon red pepper flakes, or to taste

1 (12-inch long) loaf Italian bread with sesame seeds

Lemon Mayo, recipe follows

1 (8-ounce) ball fresh mozzarella, sliced

1 bunch basil leaves

Lemon Mayo

3/4 cups mayonnaise

3 cloves garlic, minced

1/2 lemon, zested

1 teaspoon lemon juice

Kosher salt and freshly ground black pepper