Pastry Cream with Vanilla

Place ten egg-yolks in a tinned basin, adding half a pound of sugar and an ounce of fecula or corn starch; mix the ingredients well together and dilute with a quart of boiling milk, having had half a vanilla stick infused therein. Stand it on the fire and stir continually until it thickens and is ready to boil, then pour into a vessel to use when needed.