Combine sugar, vinegars and ginger in a small pot and bring to a boil, dissolve sugar and turn off heat, cool, strain and reserve.
In a skillet heat the oil over medium-high heat. Saute the onions, chili peppers, mushrooms and garlic 3 to 4 minutes, remove crushed garlic then add shrimp and toss 3 to 4 minutes more until pink and firm.
Douse the pan with the sweet vinegar, season with salt and pepper, to taste.
Serve with Shanghai Chopped Salad
4 servings