For the best punchy heat, always start with fresh dry mustard powder and warm water, as heat develops as it sits; if you prefer a milder sauce, add a bit more honey or a splash of water to soften the sharpness. This sauce thickens slightly as it rests, so you can whisk in a teaspoon of water at a time to thin it to your preferred dipping consistency. It pairs especially well with dumplings, egg rolls, roasted vegetables, or grilled meats, and can be made a day ahead for deeper flavor. Store leftovers in the refrigerator for up to 5 days and stir well before serving, as some separation is natural.