Leftover lassi can stay in the fridge for 4-5 days. You can also put it in the freezer. If you have leftovers, there are many ways you can consume this sweet lassi. Drink it like a smoothie, add oats to it, and serve it like overnight oats, use it to make cheesecake, panna cotta, pudding, ice cream, or popsicles. If you plan to use this mango and rose lassi in any of these recipes, I suggest storing them separately rather than mixing them.