Line bottom of pastry shell with almonds; set aside.
Combine flour, 1/4 cup whipping cream, and egg in a small mixing bowl. Stir until smooth, and set aside.
Combine remaining 3/4 cup whipping cream, coffee, sugar, and salt in top of a double boiler; place over boiling water. Cook, stirring constantly, until mixture is thoroughly heated.
Add reserved flour mixture to hot coffee mixture, stirring constantly, until smooth. Continue cooking until mixture becomes thickened and bubbly. Remove from heat, and stir in vanilla. Pour mixture into pastry shell. Chill thoroughly. Garnish pie with toasted sliced almonds and whipped cream, if desired.
Oxmoor House Homestyle Recipes