brazilian black bean and beef casserole

Ingredients

• 1 stalk celery, chopped finely
• 2 - carrots, chopped finely
• 2 - onions, chopped finely
• 3 cloves garlic, minced
• 1 - bell pepper, small, chopped finely
• 1/2 teaspoon orange zest, grated
• 14 1/2 ounces unsalted stewed tomatoes (1 can)
• 1 pound lean stew beef, cut into 1/2" cubes
• 4 cups cooked black beans (or 2 cans, drained & rinsed)
• - salt & pepper to taste
• 2 tablespoons vegetable oil