Heat oil in medium saucepan over medium-high heat and cook onion, ginger, curry powder and cayenne pepper, stirring frequently, until fragrant, about 2 minutes. Stir in squash and tomatoes and cook, stirring occasionally, until vegetables start to soften, about 4 minutes.
Stir in water and lentils and bring to a boil. Stir in Knorr® Vegetable Bouillon Cube and stir until Bouillon is dissolved. Reduce heat and simmer, stirring frequently, until lentils are very tender and mixture is thickened, about 15 minutes.
Serve over basmati rice and top, if desired, with yogurt and chopped fresh cilantro.