you can make the soup ahead and refrigerate in a closed container for upto 3 days. Reheat in a saucepan or microwave with additional stock as the soup would have thickened. Add some fresh toppings like vegan pesto or vegan Parmesan. Freeze: Lasagna soups don’t freeze too well. If you do freeze, then let the soup thaw overnight in the fridge and then reheat.