We suggest brown or green lentils because they hold their shape when cooked. Red lentils take less time to cook and break down easily. They will become creamy in texture, making them great for sauces, but not for salads.
If you like, you can reserve some or all of the feta cheese until after the dressing has been added. Then sprinkle the crumbled feta over the top of the salad for a pretty garnish.