How to Make It
Bring a large saucepan filled with water and 1 tablespoon salt to a boil. Add pasta and cook 10 minutes or until al dente. Drain in a colander over a bowl, reserving 1 cup pasta cooking liquid.
Place bacon and olive oil in a 12-inch skillet over medium-low; cook 8 minutes or until the bacon is crisp, stirring occasionally. Remove bacon from pan (do not wipe out pan).
Heat pan over medium. Add tomatoes, 1/4 teaspoon salt, and 1/4 teaspoon pepper to drippings in pan; cook 5 minutes or until tomatoes are tender and almost melt, scraping pan to loosen browned bits. Stir in half of the cooked bacon.
Increase heat to medium-high. Add pasta to pan; toss to coat. Add 1/2 cup reserved pasta cooking liquid and watercress, stirring until watercress wilts. Add 1/4 to 1/2 cup reserved pasta cooking liquid to pan as needed to loosen sauce. Divide pasta mixture among 4 shallow bowls; sprinkle evenly with remaining 1/8 teaspoon salt and remaining 1/4 teaspoon pepper. Top servings evenly with remaining half of bacon and cheese.
Recipe adapted with permission from Back Pocket Pasta: Inspired Dinners to Cook on the Fly, by Colu Henry.