This is will keep 4 days in the fridge.
To cook lentils: Use the pasta method. Bring 1 1/2 cup lentils (dry) and 6-8 cups salted water, to a boil, lower heat, simmer uncovered until just tender. Don’t overcook. Little black lentils cook very fast! 12-16 minutes, depending on size. Strain, let cool.