Take a bowl, mix ground chili, salt and sesame together. Add the rest of the ingredients to the bowl

Heat up cooking oil in a wok over the medium heat. When the oil is hot, and turn off the heat. Let the oil cool down for 1-2 minutes. DON'T handle the hot oil immediately

Don't pour the oil to the bowl all at once. Pour 1/3 of oil to the bowl, stir and mix with the dry ingredients in the bowl. (Caution: carefully handle the hot oil.) You'll see bubbles in the bowl while pouring the hot oil, meanwhile you'll smell the aroma and hear the drizzling sound. Then pour another 1/3 of the oil, stir and mix. Repeat the same for the remaining oil. Once oil has been transferred to the bowl, add 2 tsp vinegar, and let it cool off (the bowl is very hot, don't burn your fingers)