Agar agar is a jelly-like substance that is derived from red algae. It is a plant-based gelatin that is suitable for use by vegans as a substitute for gelatin. Agar agar has no taste, odor, or color, so it can safely be used in desserts and other cooking without altering the taste or smell. It sets more firmly than gelatin and can even set at room temperature. Agar agar can be used as a vegan-friendly substitute in any recipe that calls for gelatin as a thickening agent, including sauces, jelly-based desserts, custards, and puddings.

To use agar agar, 2 tsp of agar flakes should be used for every cup of liquid in a recipe. Like gelatin, it needs to be dissolved in liquid by bringing it to a boil over medium heat and then simmering until thickened, approximately five minutes. It should be set and chilled in the refrigerator before use. When using agar agar powder, 0.9g should be used for 100ml of neutral liquid, and 1.3g should be used for 100ml of acidic liquid.

Agar agar has several benefits, including giving a sensation of fullness, leading it to be used in some diet products. In Asia, it is also sometimes used as a digestive remedy for upset stomachs. It can also be used as a laxative or to thicken soups, sauces, or preserves.

Agar agar can generally be found in Asian supermarkets, health food stores, or online, as flakes or powder.