1. Cook the pasta according to the label until al dente. Reserve 3 TBSP cooking liquid; drain.
2. Cook bacon in a large skillet over medium heat until crisp. Cool on paper towels, crumble, and reserve. Add oil and onion to skillet. Cook until soft (5-7 minutes).
3. Add shrimp. Raise heat to medium-high; cook until opaque (5-6 minutes). Toss in watercress, pasta with water, bacon, pepper, and red pepper.