Sauté the garlic and onion until soft and translucent. Add lentils and seasonings, and stir well. Add the water and bring to a boil. Reduce to medium heat and occasionally stir for 25-30 minutes, until lentils are tender and slightly soft (all of the water should be absorbed, and should not be mushy).
Stir in the salsa and heat for another 3-4 minutes.
Serve over a bed of lettuce for a taco salad or with whole grain tortillas.