Many
years ago, before I knew much about cooking, I was making a recipe
that called for French green lentils and used Indian green lentils
instead, thinking they were the same thing. It is easy to confuse
them, since they're both green. Especially in the US, unless you go
to a specialty store or a health food store, you won't find many
varieties of lentils. Though the two lentils are similar in color,
French lentils are darker, smaller, and hold their shape much better
after cooking. They're also called Puy lentils (lentilles du Puy)
because they're originally grown in the French region, Puy.