sentence: add butter to the pan sentence: stir flour into the butter sentence: add milk to the pot sentence: add salt pepper and nutmeg sentence: add an egg yolk to the sauce sentence: grate cheese into the sauce sentence: slice the bread sentence: spread the sauce onto to bread sentence: add pepper and ham to the bread sentence: spread sauce and grate cheese on top of the ham sentence: slice the bread and place on top of the sandwich sentence: spread sauce and grate cheese on top of the sandwich sentence: toast the sandwich in the oven