in a 6-8 qt. pan, cook vermicelli in about 4 qts. boiling water until al dente - 8 to 10 minutes; or cook according to package instructions. Drain well and tranfer to a rimmed platter; and keep warm. While pasta is cooking - stir together pineapple-coconut juice and cornstarch until blended; set aside.
Heat oil in a wide non-stick frying pan or work over medium high heat. When oil is hot, add onion, garlic and 2 tbsp. water. Stir-fry until liquid has evaporated and onion is soft and beginning to brown (about 5 minutes). Add curry powder, coriander and red pepper to pan; stir to blend. Immediately add shrimp and stir-fry for 2 minutes.
Stir cornstarch mixture well; pour into pan. Stir until sauce is bubbly and shrimp are just opague in center; cut to test, cook 1-2 minutes more. Add parsley (or cilantro) and mix gently but thoroughly.
Spoon shrimp mixture over pasta; garnish with lime wedges. Season with salt.