Greek Minestrone

Ingredients

• 2 stalks celery , finely chopped
• 1 large onion , finely chopped
• 2 cloves garlic , minced
• 1 tablespoon olive oil
• 5 cups beef broth
• 1 cup water
• 1/2 cup uncooked arborio rice
• 6 cups torn spinach
• 1 can great northern beans , drained and rinsed
• 2 cups chopped tomatoes
• 1 1/2 cups zucchini , coarsely chopped
• 1/4 cup snipped fresh thyme
• 1/4 teaspoon cracked black pepper
• 1/2 cup crumbled feta cheese