GET ORGANIZED: °Soak the rice in water and set aside for 15 minutes. °Soak the saffron threads in 1/4 cup warm water and set aside. °Chop the onions and red pepper finely (or use a processor). °Drain the tomatoes and set aside. °Measure the remaining seasonings and liquids. °Microwave green beans in covered dish for 4-5 minutes until tender. Rinse in ice cold water to shock them and maintain a bright green color. ° Have peeled, deveined shrimp ready to go.
COOK CHORIZO: (Skip this step if using dried chorizo already cooked.) Spray a small saucepan with oil. Pierce churizo sausages in a few places with a fork and place them in pan. Heat to medium high. Cook for 2-3 minutes to brown. Add enough water to almost cover sausages, lower heat to medium and continue to cook for another 5 minutes. Remove from pan and slice into 1/4-1/2 inch rounds. They will finish cooking with the rice.
SAUTE VEGGIES THEN ADD RICE: Heat olive oil in large sided pan (14-18 inches). Add onions and pepper and saute for 3 minutes, stirring occasionally. Add garlic and saute for 1 minute. Add tomatoes, paprika, sugar, chili flakes (if using) and salt and pepper. Stir well for 2 minutes until mixture is pasty. Drain rice, then add it to tomato mixture. Stir until well coated, about 2 minutes.
ADD LIQUIDS, CHORIZO AND COOK: Add wine, broth and saffron-soaking liquid. Add chorizo. Stir to settle everything in pan evenly. Do not stir again. Bring to boil, then reduce heat to Low (about 3 or 4 out of 10). Cook rice, uncovered, for 18-20 minutes, moving pan around for even cooking, Rice will be almost but not quite cooked. If it appears to dry after liquids are absorbed, add 1/4 cup extra broth.
ADD SHRIMP: Lay shrimp on top of rice and partially press into rice. Cook for 5 minutes uncovered. Turn shrimp over. Add green beans. Cover with foil or a pan cover and cook another 5-7 minutes until beans are warmed through and shrimp are cooked (they will turn pink and be slightly translucent inside but mostly opaque).
FINISH AND SERVE: Bottom of rice will be crispy. This is called Socarrat. If you want it crispier, you can try increasing the heat for a minute or two, being careful not to burn the rice. Taste and adjust seasonings, squeezing on half a lemon and adding more salt and pepper if needed. Stir everything together. Sprinkle on parsley and serve with extra lemon wedges.