• In a very large, deep skillet with a lid or a dutch oven, heat 1 tbsp. olive oil. Add onion and 1 tsp. garlic. Saute until onion is translucent. Be careful to not burn the garlic.
• Add crushed red pepper and rosemary. Stir.
• Add diced tomatoes and cannelini beans. Stir. Cover the pan, and reduce heat to simmer while cooking the fish.
• In a large saute pan on medium-high heat, add remaining tablespoon olive oil and the remaining teaspoon of garlic. Give it a good stir. When garlic is sizzling, add fish fillets to the pan.
• After a couple of minutes, lift the edge of the fish. When the fish shows some browning, and beginning to become opaque white on the top, carefully turn the fish using a spatula.
• While fish cooks on the second side, add fresh spinach to the bean and tomato mixture. Give it a good stir, and replace the lid. Turn off the heat. Allow the spinach to wilt. Check for seasoning. Stir to combine.
• Squeeze the fresh lemon juice over the cooked fish fillets.

To serve:

• Divide the cannelini bean, tomato, spinach mixture among 4 plates or large shallow bowls. You need a little bit of a lip to confine the juices.
• Top each with a fish fillet, and garnish with parsley and a wedge of lemon if desired.