This is a very common issue people run into. Although we would recommend investing in a blender, if you aren’t going to use it a lot, it doesn’t make sense to spend all that money. Luckily, you can still blend your red lentil spinach soup without a blender. Because you are cooking the ingredients until they are completely soft, you can easily mash them using a potato masher for a more textured soup or strain it through a sieve for a smoother version.