Cook bacon in 7-qt. stockpot. Use slotted spoon to remove bacon from pan, reserving 1 tsp. drippings in pan. Drain bacon on paper towels. Add Red Sofrito and onions to pan; cook 3 min., stirring frequently. Stir in next 5 ingredients; bring to boil. Simmer on low heat 10 min. Add mussels; cover. Cook 2 min. Add red snapper; cook, covered, 2 min. Add shrimp; cook, covered, 4 min. or until shrimp turn pink. Discard any unopened mussels.Top stew with bacon.