In a large Dutch oven or heavy pot, heat red Thai curry paste and 1/4 cup vegetable stock over medium-high heat until just simmering. Add the diced onion and sauté, stirring frequently, until soft and slightly golden (about 4 to 5 minutes). Stir in squash and another 1/4 cup vegetable stock and continue to sauté for an additional 5 minutes. Stir in the remaining 1 1/2 cups vegetable stock, sliced tomatoes, coconut milk, and lentils and bring pot to a boil. Reduce heat to low, cover, and simmer for 15 to 20 minutes, or until the lentils are tender. Remove cover and gently stir in chickpeas and chopped kale until kale is just wilted. Remove from heat, season, serve, and enjoy!