Mix 2 1/4 tsp yeast in 1/2 c very warm water. Stir. Melt 1/2 c butter and stir into 1/4 c sugar, a pinch of salt and 1/2 c evaporated milk. Add the yeast and stir. Beat in 3 1/2 c flour and knead together. Place in a bowl and cover with a clean towel. Allow to rise for an hour.