Cook brown rice according to package directions; when almost done , add beans for final few minutes of cooking. Drain rice and beans; return to pan with scallions; stir. Set aside
Meanwhile, bring 1¼ cups water to boil in a pan. Using a handheld blender, mix in bouillon, then add another 1¼ cups water to make stock. Remove from heat.
Heat 2 tsp vegetable oil in a large pan over medium heat. Add flour and stir in oil until a paste forms. Continue cooking, stirring until golden brown. Remove from heat.
Add a little chicken stock to pan; stir until combined to make sauce. Repeat, adding a little stock at a time until all liquid is combined. (If lumpy, pulse with hand blender).
Heat a deep frying pan on high heat; add 1 tsp oil. Add onion, and garlic; cook 2-3 minutes, then add saucisson and dry spices; stir 1 minute.
Add prawns and sauce. Then add Tabasco and Worcestershire sauces and bring to a boil. Simmer for 3-4 minutes and serve with rice and beans.