To cook lentils:
Combine 1 cup red lentils with 4 cups water and bring to a simmer in a medium-sized saucepan. Simmer covered for 30 minutes, stirring frequently to keep the lentils from sticking. Remove from heat and cool. Use 1 cup of the cooked lentils in this recipe, and refrigerate the leftovers. You can add it to baked goods and main dishes for extra nutrition. It will not affect the taste.
Some people may find the smell of the lentils unappetizing when they are mixing the bars. Don't worry about this if you notice it. It will not be present in the completed dish!