Beluga lentils are a type of small, black lentil, which get their name from their resemblance to Beluga caviar. Black lentils are prized culinarily because they are dark and dense and are just perfect for those recipes that call for that dark intense color. They are low in calories; they are an excellent source of high-quality plant protein; an outstanding source of fiber; rich in minerals, including calcium, potassium, and magnesium and a good source of B vitamins, especially folate.