My mayo - 0.1% yoghurt (c.300 ml), 1 tablespoon sugar- and oil-free retro-mustard (any sugar and oil free will do but if you use Dijon-style mustard, use less - or to taste), greens (fennel, parsley, whatever you fancy), spices (black and white pepper, garlic, whatever); sometimes I add home-made chicken broth to replace part of the yoghurt; a sugar-free pickle finely chopped; marinated sea wrack instead of the pickle; key is improvise

I use it for salads, as sauce on top of egg white omellettes; my parents took to it and use it on top of everything, pasta included