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In a medium saucepan, whisk the condensed milk and egg yolks together. Add the butter and cook over medium heat, stirring constantly, until thickened, about 10 minutes. Remove the saucepan from the heat and stir in the coconut, vanilla and pecans. Pour the filling into a bowl to cool.
To assemble the cake: Set one cake layer on a cake stand or serving plate. Spread the top with half of the filling. Add the second cake layer and spread the top with the remaining filling.