I have used Sriracha to provide some heat to the sauce. Sriracha is a hot sauce made from the paste of chili peppers and is mildly spicy. It is commonly used in Southeast Asian cuisines (Thai & Vietnamese) and has the consistency of ketchup. With garlic flavors, Sriracha has a tangy, hot, and sweet taste. Add as much as you can tolerate. After adding and mixing the sauce, you can taste it and add more.