Chilli sauce is a condiment based on chillies, ranging from tomato-based table sauces to fermented Asian varieties and fiery Caribbean pepper sauces. It adds heat, acidity, and complexity to foods, with capsaicin providing the burn and vinegar or fermentation the tang. Uses span drizzling over eggs and noodles to marinating meats and livening up bland dishes. Commercial sauces vary enormously in heat and must be labelled with ingredients and allergens. Homemade versions need acidification and proper processing if kept, since low-acid pepper mixtures can support botulism. A dash transforms a dish; a spoonful defines it.