Heat oil, aniseed, cinnamon, bay and Szechuan pepper in a pot and simmer for about 20 minutes. The spices must not burn! Then let them cool down for about 30 minutes. Lift out the spices with a skimmer. Mix chili flakes, 2 teaspoons salt and oil in a preserving jar. Close the jar when it has cooled down completely. Stored in a dark and cool place, the chili oil will keep for several months.