Cheesy Stuffed Tomatoes

Name: Cheesy Stuffed Tomatoes
Ingredients: 4 large tomatoes; 1 tbsp. extra-virgin olive oil; 1 shallot, minced (1/4 cup); 1 Garlic clove, minced; 1/2 lb. sweet Italian sausage, casings removed; 1/4 c. chopped basil, plus more for garnish; 3/4 c. panko crumbs; 3 oz. Fontina cheese, cut into 1/4 cubes (3/4 cup); 1/4 c. grated Parmesan; kosher salt; Black pepper