Asian Sweet-and-Sour Sauce

Procedure

1. Heat the oil in a saucepan or sauté pan over moderate heat.
2. Add the onion. Cook until soft, but do not brown.
3. Add the ginger, sugar, and pineapple. Cook until sugar and fruit just start to caramelize.
4. Add the lime juice, vinegar, and cayenne. Bring to a simmer, then remove from the heat.
5. Put all ingredients into