Bring 8 cups water to a boil in a medium saucepan. Add lentils, and reduce heat. Cover with a round of parchment, and gently simmer until tender, about 30 minutes. Drain lentils, and let cool completely, about 30 minutes. (Lentils can be made 1 day ahead and refrigerated.)
Place cashew butter, lemon juice, garlic, hot sauce, and 1 teaspoon salt in a food processor, and process until combined. Add lentils, and process until smooth, about 2 minutes. With motor running, add 2 teaspoons oil, and process until incorporated. Transfer to a bowl, and chill if desired. Drizzle with remaining oil, garnish with parsley, and serve with pitas.
Packed with more protein than traditionally used chickpeas, lentils provide a creamy base for hummus.