Glazing Paste

Name: Glazing Paste
Yield: Makes 1/4 cup
Ingredients: 2 egg yolks; 1 teaspoon Colman's mustard powder; 1 clove garlic, minced; 1/2 teaspoon salt; Pinch of cayenne pepper; 1 tablespoon grated onion; 1 teaspoon lemon juice; 1 tablespoon all-purpose flour, more if needed