Ginger dressing

1 small onion, 2 Tb ketchup, 1 tsp mirin, 1 Tbs veg oil (recipe called for peanut oil along with a ton of other stuff I didn't have), 2 Tb. fresh ginger, 2 cloves garlic, 1 tsp. soy sauce

Puree in mini food processor until it resembles dressing.