β Aquafaba (Best Nut-Free Option)
3 tablespoons aquafaba per 1 whole eggAquafaba is the viscous water from cooked chickpeas or other legumes. It contains proteins and starches that can trap air when whipped, closely replicating the foaming properties of egg whites essential for mousse structure.
For best results, use chilled aquafaba and whip it until stiff peaks form. Avoid overwhipping as it can become dry and grainy. Adding a pinch of cream of tartar can stabilize the foam.
The final mousse will be very close in texture and lightness to the original egg-based version, with a slightly less rich mouthfeel but excellent aeration and stability.