Put two tablespoonfuls of chopped onions, or eschalots, cleaned as above, into a stewpan; put also four tablespoonfuls of vinegar and a bay-leaf, and boil; then add ten tablespoonfuls of brown sauce, half a one of chopped parsley, ditto of green gherkins ; boil five minutes, skim, add a little sugar, taste if well seasoned, take out bay-leaf and serve.