Vegan Roasted Banana Ice Cream

Name: Vegan Roasted Banana Ice Cream
Ingredients: 200 grams raw unsalted cashew nuts; water for soaking; 435 milliliters water; 2 tablespoons coconut oil; 4 ripe bananas, peeled and sliced into half a centimeter slices; 2 tablespoons dark brown or muscovado sugar; 1 pinch salt; 150 grams white sugar; 60 milliliters water; 4 tablespoons coconut oil; 1 teaspoon salt; 400 milliliters coconut cream; half teaspoon ground cinnamon; half teaspoon vanilla extract; 50 grams chopped walnuts, toasted (optional); 50g grams dried banana slices (optional)