Amazingly, you use the bean brine *exactly* like egg whites. It whips to stiff peaks, then you add the sugar and it whips to glossy, hold-it-upside-down perfection. This was simply 1/2 cup (1 can) of chickpea Aquafaba whipped with 1/4 teaspoon of apple cider vinegar (for stability - cream of tartar works too, apparently, as with 'normal' meringue), and a cup of caster sugar. Boom.
Baked in a super-low oven, 100C, for 2 hours or so.
I even made a little pavlova, which I've never even had, let alone made.
Sweetness-wise, its obviously pretty full-on, but I understand that you can use this magic new ingredient to make mayo, perfect breaded tofu, fudgy brownies, killer waffles - who knows what else can be done! There's an international Facebook group dedicated to 'hits and misses' - and this is one of the things I love about vegan cooking; the creativity, the community spirit, and the willingness to share these crazy discoveries. Until the professional chefs catch up, it's all grassroots experimentation, driven by home cooks and food bloggers. Punk rock.
I, for one, have dug out my French cookbooks and am rummaging for inspiration in the formerly impossible. Index: Egg Whites.