Wash & drain lentils. Combine with ater, bring to a boil, add salt, reduce heat & simmer, covered 45 minutes to 1 hour. Heat oil in a large skillet, add the onion & garlic & saute until soft & translucent. Add the saute to the lentils. Add the potatoes, spinach, lemon juice, coriander & pepper. Stir thoroughly & simmer until the vegetables are cooked. Add more water if desired. Serve accomapnied with pita wedges.