You can serve the marinara on pasta as it is, or add meat to it for a pasta sauce. It's the same as the sauce for chicken cacciatore and stuff like that too.
Easy Chicken Cacciatore
1 teaspoon olive oil
1 pound boneless, skinless chicken breast halves, cut into 1-inch pieces
1 large green bell pepper, seeded and cut into thin strips
1 (15-ounce) container Marinara Sauce
1/2 cup water
2 cups hot cooked rice
HEAT oil in large nonstick skillet over medium-high heat. Add chicken and bell pepper; cook, stirring frequently, for 5 minutes or until chicken is lightly browned.
ADD sauce and water to skillet; bring to a boil. Reduce heat to low; cover. Cook for 5 minutes or until chicken is no longer pink. Stir in cooked rice.
Makes 4 servings.