German Chocolate Fudge

Ingredients
For the fudge:
1 cup (2 sticks) unsalted butter, cut into 8 pieces
2 cups semi-sweet chocolate chips
2 cups milk chocolate chips
4 1/2 cups sugar
1 (12 oz) can evaporated milk
2 teaspoons vanilla extract
For the topping:
1 cup evaporated milk
1 cup granulated sugar
3 egg yolks
1/2 cup (1 stick) unsalted butter
1 1/2 cups sweetened flaked coconut
1 cup pecans or walnuts, chopped
Preparation