Please help a healthfood novice. I am making a recipe that calls for puy lentils. When I went to my local smallish supermarket, they had green lentils, red lentils and mixed lentils but the only puy lentils I could see were in ready meals.
So, having seen a picture of the recipe, I bought green lentils as they were the right colour. Is this a mistake? What are puy lentils and how do they differ from any other lentil?