Not-too-sweet autumn dessert: acorn squash pie with apples

Ingredients

for the pie filling:

• 2 whole acorn squash
• four tablespoons butter
• 1 cup evaporated milk
• 3 eggs
• 1 cup sugar
• 1 teaspoon vanilla extract
• 1/2 teaspoon cinnamon
• 1/2 teaspoon nutmeg
• 1/2 teaspoon cardamom
• 1/4 teaspoon cloves
• A pinch of salt
• 1 Granny Smith or Macintosh apple