Start by mixing the sugar, cinnamon, salt, ginger and cloves in a small bowl. In another larger bowl, beat the eggs. Stir in the sweet potatoes and sugar-spice mixture then gradually stir in the soy milk.
Pour the mixture into the unbaked pie shell and bake in a preheated oven at 450° F for 15 minutes. Reduce the temperature to 350° F and bake for another 30 to 45 minutes or until a knife inserted near the center comes out clean. Cool on a wire rack for 2 hours.
Serve immediately or refrigerate. Top with whipped cream before serving!