Make the Cashew Cream:In a small bowl soak the cashew in hot water for 20 minutes. Drain and rinse then add them to a powerful blender together with 1.25 cups of water, the lemon juice, garlic powder and nutritional yeast.
Make the Scalloped Potatoes:Slice the leeks lengthwise then chop them up. Add them to a bowl with cold water. Stir to rinse well and allow them to stay in the water for a few minutes.