Put 1 cup of the sugar in heavy skillet and place on low heat. Stir continually till sugar caramelizes and turns light brown. Add 1 cup of the evaporated milk. Sugar will harden into a lump; stir and cook till smooth and free from lumps. Then slowly add 1 more cup sugar; then 1 cup milk; 1 cup sugar; and finally the last cup of milk. Stir continuously till firm-ball stage is reached. Add nuts and drop by teaspoon onto buttered cookie sheet. Makes about 2 pounds of candy.