• 1/4 tsp. red pepper flakes
• 1/3 c. grated Parmesan cheese
To make the crostini: Adjust an oven rack to 6 inches from the broiler and turn the broiler on to high. Place bread on a baking sheet and brush both sides with oil. Broil until the bread is browned, 1 to 2 minutes. Flip, sprinkle about a teaspoon of Parmesan over each piece and broil about 1 to 2 minutes more, until the edges are brown and the cheese is bubbly. Transfer crostini to a cooling rack and set aside.
To make the sauce: In a blender, purée the tomatoes with their juices. In a medium-sized heavy saucepan, heat the oil over medium heat. Add the garlic and cook, stirring, for 1 to 2 minutes, until fragrant, but not browned. Add tomatoes, sugar, salt, pepper and oregano. Bring to a boil. Reduce the heat to low and simmer for 20 to 25 minutes or until slightly thickened.
To make the meatballs: Meanwhile, set oven to 400 degrees and spray a large rimmed baking sheet with cooking spray. In a large bowl, combine the beef, ricotta, breadcrumbs, Parmesan, pesto, egg, garlic, salt, pepper and red pepper flakes and gently mix together. Form into 19 (1 1/2-inch) meatballs. Transfer onto prepared baking sheet and bake for 15 to 20 minutes, until cooked through.