2 tins condensed milk (397 grms), 1 tin (same can) sugar, 1 tablespoon butter, 1 teaspoon vanilla essence. Put milk and sugar in a thick bottomed non-stick pan, keep it on heat and keep stirring till it thickens and starts forming into a thick mass. Ensure that fire is low and that you keep stirring. You will notice that the colour changes from cream to dark tan (tea-with milk colour). Wait till it leaves the edges of the pan, then drop a little in a cup of water. If the ball hardens in the water it is done, if not continue stirring. When done add vanilla essence and butter. Work quickly and pour onto a flat greased surface, flatten the surface, apply little butter to the rolling pin and roll to desired thickness. Cut when warm and before it sets. Apply butter to the knife so that edges can be smooth and neat. Gently scoop up with knife. Cool and store in airtight box.