Afghani Kebab Sauce - cooking recipe

Ingredients

2 onions, peeled and chopped
2 cups plain yogurt
1 dash fresh lemon juice or 1 dash rice vinegar
sugar
fresh ground black pepper
2 tablespoons ground cumin
2 tablespoons ground coriander
1/2 - 3/4 teaspoon cayenne pepper or 1/2-3/4 teaspoon chili paste
2 teaspoons ginger-garlic paste
fresh cilantro, chopped
1/2 teaspoon ground turmeric

Preparation

Place all the ingredients in a blender and process until smooth.
Simmer in a saucepan until slightly thickened.
Let cool before using as a marinade.