Wholemeal bread. 'Pure' margarine on one slice, a little Natex yeast extract on the other. Whole peanut butter on top of the yeast extract. Whole Earth or Sainsbury's own brand are more or less the same.
A finely chopped strong spring onion (the fat ones) on top of that with a very good squeeze of lemon juice all over it.
Assemble the sandwich, let it stand for 15 minutes or so then eat! Tastes just like a nice, strong Cheddar cheese sandwich.
If you want it sweeter, some thin slices of apple are nice.
posted by Nemo