In a bowl, combine the juice of 1/2 of lime, sweet chili sauce, mustard, horseradish and vinegar. Set aside.
Heat 1/2-inch of oil in 12-inch heavy pan.
Cut plantain on diagonal into 1-inch thick pieces, remove peel.
When oil is hot, add the plantains and fry both sides until golden.
Drain on paper bag, and sprinkle with salt, and minced garlic. With a flat bottomed, heat proof, glass bowl, smash plantains evenly flat, embedding garlic into them. Return to hot oil and fry until dark golden brown. Remove, drain again on a paper bag, adding more coarse salt, to taste, the red pepper flakes, the cayenne pepper and a squeeze of lime.
Serve while hot with sweet heat sauce.