Which is the most nutritious way of sprouting grams?

Do you mean "sprouting grains"? I imagine it's like any other sprout, you soak them in water for a few hours, then lay them in wet paper towels in a warm place, or in a large glass jar with a lind that you poke holes in. The you run room temp water in and drain it, to keep them moist, every day until they sprout. If the grains are viable, they should sprout in just a few days.