Combine lemon zest, paprika, garlic, salt, and pepper in a bowl. Add shrimp and toss.
STEP 2
In a large pot, melt butter over medium-high heat. Add shrimp, cooking until pink and curled, about 3 minutes. Transfer shrimp to a plate; set aside.
STEP 3
Add leeks with salt and pepper to pot. Cook until soft and browned, about 5 minutes. Add beans and stock, bring to a boil. Lower heat and simmer, 10 minutes. Stir in reserved shrimp, parsley, and lemon juice. Serve with toasted bread.