The key to a good peanut sauce for Indonesian Satay is achieving a balance of sweet, savory, spicy, and tangy flavors, along with a smooth, creamy texture.
Creating the perfect peanut sauce involves several key elements. First, the peanut base should be made from high-quality roasted peanuts, either ground into a smooth butter or finely chopped. The sweetness typically comes from Indonesian sweet soy sauce (kecap manis), which adds a rich, molasses-like flavor. Savory notes are achieved with ingredients like garlic, shallots, and sometimes shrimp paste (terasi) for added depth. Chili peppers, either fresh or dried, provide the desired level of spiciness. Finally, a touch of acidity, usually from lime juice or tamarind paste, balances the flavors and adds a refreshing tang. The sauce is then simmered with water or coconut milk to achieve the desired consistency, ensuring all the flavors meld together harmoniously. The ratio of these ingredients is crucial and can be adjusted to personal preference, but the balance is what truly elevates the sauce.
To prevent the peanut sauce from separating, add a small amount of cornstarch slurry (cornstarch mixed with water) towards the end of the cooking process. This will help to emulsify the sauce and keep it smooth.