Raw materials of mustard duck feet: cooked duck feet 800g, mustard 20g, white vinegar 8g, salt 2g, white sugar 1g and sesame oil 15g. Production of mustard duck feet: 1, the bones of cooked duck feet are removed with toothpicks, and cut in half longitudinally for later use. 2. In order to make mustard spicy, pour mustard into a small bowl, add 20 grams of boiling water and simmer for about 15 minutes. 3. Mix the white vinegar, salt, sugar and sesame oil, then pour into the mustard bowl and continue to be stuffy for 3 minutes. 4. Add water to the pot, blanch the cut duck feet with boiling water, take them out, let them cool, and stir them evenly with the seasoning in the mustard bowl, then serve. Tips for making mustard duck feet: 1. Filling mustard with boiling water is the key to making mustard duck feet, which is a classic Shandong dish. 2. Duck feet must be thoroughly cooled before mixing seasoning, otherwise it will affect the taste.