Prepare Ingredients: Mince the garlic and chop the spring onion. Toast the sesame seeds if not already toasted.
Mix Sauces and Spices: In a bowl, combine soy sauce, red chili sauce, Schezwan sauce, chili flakes, and garlic.
Add Hot Oil: Heat oil until very hot and carefully pour it over the sauce mixture to release the flavors and aromas.
Add Sesame Seeds and Spring Onion: Stir in toasted sesame seeds and garnish with chopped spring onion.
Serve: Use the chili oil sauce as a dip or mix-in for spring rolls, samosas, noodles, or other snacks.