Cut the ends with the stems off the chilies and tomatoes.Remove the skin from the onions and garlic.Roughly chop everything and put it in a hand blender jar, mini chopper, or blender.Add sugar, salt, vinegar, and oil.Blend well until it becomes a uniform mass.Put it in a saucepan and bring to a boil.Turn down to low heat and let it simmer for 15-25 minutes.Optionally, season with salt and pepper.Pour the sauce into a sterilized jar and store in the fridge.