Scallion Ravioli in Fresh Tomato Sauce

Name: Scallion Ravioli in Fresh Tomato Sauce
Cuisine: European, Italian, Mediterranean, Asian
Ingredients: 1 pound firm tofu; 3/4 teaspoon salt, plus more to taste; 1/4 teaspoon freshly ground black pepper, plus more to taste; 1/3 cup thinly sliced scallions; 1 large egg white; 24 two-and-a-half-inch-round gyoza wrappers (available at Asian markets); 6 ripe plum tomatoes; 3/4 teaspoon minced garlic; Pinch of cayenne pepper; 1 tablespoon balsamic vinegar; 1 1/2 tablespoons freshly grated Parmesan; Olive-oil cooking spray