After many years and thousands (perhaps, millions?) of plates of rice and lamb doused in "white sauce," the Halal Guys have revealed one of the greatest secrets behind the cult favorite street cart. The team just debuted packets of white sauce and hot sauce to replace the usual squeeze bottles for takeout orders, and these packets of course have to list what's in those magic sauces. For the white sauce it's:
Soybean and/or canola oil, egg yolk, vinegar, water, salt, sugar, natural flavors, black pepper, disodium EDTA, xantham gum and sodium benzoate.
Oil + egg yolk + vinegar = mayo. So there you have it. Of course, those "natural flavors" are still a mystery, and those are clearly the key to turning ordinary mayo into white sauce of the Gods. The hot sauce, meanwhile, is just the standard red pepper, vinegar, salt, spices and concentrated lemon juice.
But perhaps even better news than knowing these secrets, is that white sauce packets could potentially be pocketed and eaten at a later date, perhaps in private, straight from the packet.