Mozzarella-And-Olive Orzo

Ingredients

• 1 (12-ounce) block mozzarella cheese
• 16 ounces uncooked orzo
• 2 tablespoons butter or margarine
• 2 tablespoons olive oil
• 1 1/2 cups chopped onion
• 2 cups chopped celery
• 2 tablespoons all-purpose flour
• 1 cup chicken broth
• 1 (28-ounce) can plum tomatoes, drained
• 1 teaspoon dried basil, crushed
• 1/2 teaspoon dried crushed red pepper
• 2 (2 1/4-ounce) cans sliced ripe olives, drained
• 1/4 teaspoon salt