An artists impression of a jar of Marmayo, mixing marmite with mayonnaise. The label reads Yeast Extract with Mayonaisse

Mocking up a product that I want for my egg sandwiches - a mixture of Marmite and Mayo. Yes, yes, I know Marmite is divisive, but one potential problem I can see is colour. Keep the Marmite content low and it can look like a nice mustard. The more you add, the more it resembles 💩.