Creamy Carrot Ginger Bisque With Cashew Cream

Name: Creamy Carrot Ginger Bisque With Cashew Cream
Ingredients: 1 tablespoon olive oil; 3/4 cups onion, diced; 1/2 cup celery, diced; 1 1/2 inch piece of ginger, chopped finely; 4 cups vegetable stock; 1 medium/small russet potato, cut into large pieces; 1 1/4 pound carrots, chopped; sea salt to taste; 1 1/2 teaspoon mild curry powder; 2 cups raw cashews; 1 cup cold water, and more as needed; 1/2 - 3/4 teaspoon sea salt (optional); 1-2 tablespoon lemon juice (optional); 2 tablespoons demerara sugar or maple syrup (optional)