I’m testing a chocolate, animal-free aquafaba mousse sweetened with date syrup instead of granulated sugar; at 8% syrup by weight, the foam slumps after about 2 hours in a 38°F case. Has anyone had better stability using a tiny dose of citrus pectin or agar (0.2–0.3%), or is an Italian aquafaba syrup cooked to 240°F the cleaner route here without leaning on gums?
I’d go Italian with aquafaba: stream a ‘240°F’ syrup made from date syrup cut 70/30 with glucose or sucrose into medium peaks with about 0.1% cream of tartar — way cleaner and more stable than 0.3% agar, which can get brittle and weep at 38°F. If you must use pectin, LM + a pinch of calcium (≈0.2%/0.05%) is gentler than citrus HM; think of the hot syrup as giving the foam a seatbelt — have you tried that blend?
Agar at 0.2–0.3% will set but tends to get brittle/weepy in a cold case, and HM pectin won’t gel with only 8% syrup (LM needs calcium), . What’s worked for me is reducing the aquafaba about 30% first and folding in 1–1.5% melted cocoa butter with the chocolate — it kept shape well past “2 hours in a 38°F case” without gums. If you go syrup, piggyback @dchung75 but acidify to ~pH 3.5 with 0.1–0.2% cream of tartar before streaming; have you tried that tweak?
Small tweak that saved ours: emulsify about 0.8% melted cocoa butter into the 240°F date+glucose syrup, acidify to ~pH 3.6 with a pinch of citric, then stream into medium peaks. The cocoa butter sets in the case and we get 24+ hours without gums — @leo_baker92 have you tried a tiny fat set like that?
At 38°F, replace part of the 8% syrup with date sugar (2–3%) to boost solids, @dchung75.