How to Make It
Cook pasta according to package directions, omitting salt and fat. Drain in a colander over a bowl; reserve 1 1/2 cups cooking liquid.
Chop 1 cup tomatoes. Halve remaining 2 cups tomatoes. Cook pancetta in a large nonstick skillet over medium until crisp, about 8 minutes. Remove pancetta from pan with a slotted spoon. Add chopped tomatoes to drippings in pan; cook, stirring occasionally, until softened, about 2 minutes. Add halved tomatoes, kale, garlic, rosemary, pepper, and salt; cook 2 minutes. Add 1 cup reserved cooking liquid; cover and cook until kale is wilted, about 2 minutes. Stir in pasta and pancetta. Add remaining 1/2 cup cooking liquid, 2 tablespoons at a time, as needed to thin sauce. Top with cheese and pine nuts. Serve immediately.