Put the garlic, cilantro, and ginger in the work bowl of a food processor and work until they are finely chopped. Add the oils, peanut butter, ½ cup soy sauce, and sugar; process again until well combined with the seasonings. Stop and scrape down the sides once or twice. Add the vinegar and season to taste with the additional soy sauce, if necessary. If the sauce is thicker than you wish, thin it with hot water. Store the sauce in an airtight jar and keep it refrigerated. Thin it again with hot water as needed before using. This sauce will keep for months.