Lentils with kale and butternut squash

This can either be a hot dish or a cold dish/salad.

1 butternut squash, peeled, roasted and cubed
1/4 teaspoon ground cumin
Salt and freshly ground black pepper
1 cup lentils
1 1/2 teaspoons red wine vinegar, plus more to taste
2 tablespoons olive oil
1 carrot, diced small
1 rib celery, diced small
1/2 onion, diced small
1/4 teaspoon dried red pepper flakes
1/2 pound chopped kale, about 6 cups
1 clove garlic, minced

Place the lentils in a medium saucepan and cover with water by 2 inches. Season generously with salt and bring just to a boil. Reduce to a simmer and cook until the lentils are tender but firm, about 20 minutes. Drain, rinse well, stir in the vinegar and salt and pepper to taste. While the lentils are cooking, heat 2 tablespoons olive oil in a large skillet over medium heat. Add the carrot, celery, onion and dried red pepper flakes, and cook until the onions and celery are translucent, about 5 minutes. Rinse the kale under water and add it, still dripping, to the skillet in heaping handfuls. Add the minced garlic and salt to taste, and stir to mix well. Cover the pan, leaving the lid ajar, reduce the heat to low, and cook, stirring occasionally, until the kale is very soft, dark and frazzled looking, about 30 minutes. It should be very sweet. Stir the lentils into the cooked kale, taste and adjust seasoning for salt, pepper and vinegar. Gently stir in about 2 cups of the roasted squash before serving, snd sprinkle with cumin