How is the sweet sauce used by many food stalls thickened?

Homemade Sweet Noodle Sauce

I. Ingredients

Main ingredient: 100 grams of flour

Supplementary ingredients: 300 grams of water, 5 spoons of soya sauce, 10 grams of salt, 80 grams of sugar, 3 grams of five-spice powder, the right amount of oil

Second, practice

1. 100 grams of flour

2. Add 3 times the water

3. 3, stir into the batter

4, and then add 5 spoons of dark soy sauce, you need the color focus can add a little dark soy sauce

5, stir well

6, and then add the sugar

7, and again keep stirring well

8, the pan into the cold oil

9, and then add the stirred batter

10, Add five-spice powder

11, medium heat and keep simmering

12, add some salt

13, again medium heat and simmer for about 10 minutes, taste the sweetness and saltiness

14, simmering like this

15, and then put in a bowl to cool the freshness of that