Almond Fudge

Source: Hazel's Candies: Copper Kettle Trade Secrets - Hazel Holen

3 ounces whipping cream
1 1/2 cups granulated sugar
1/4 cup corn syrup
2 tablespoons butter plus butter for greasing kettle
1/2 teaspoon salt
1/4 cup plus 1 tablespoon Marshmallow Cr