Serves 4 to 6 Ingredients 1 English cucumber 1 jar of Marmite or Vegemite 1 stick of good, unsalted butter (such as Plugra) 1 loaf of Brioche (or any fine-crumb white) bread, thinly sliced & crusts removed Directions Slice the cucumber very thinly on a mandolin. Spread butter onto four slices of the bread. Thinly…