Chicken and Rapini Penne Pasta

1 . Stage

Trim thick stems off rapini and coarsely chop.

2 . Stage

Bring a large pot of salted water to a boil. Add rapini, return to a boil, and cook until stems are crisp-tender, 2 to 3 minutes. Remove from the water with a slotted spoon and allow to drain completely. Save the pot of water to cook the penne in.

3 . Stage

Heat olive oil in a large frying pan over medium heat. Add red onion and cook for 2 minutes. Add garlic and red pepper flakes; cook for 30 seconds. Add rapini and white wine; cook until the wine is reduced by half.

4 . Stage

Meanwhile, return the pot of water to a boil. Add penne and cook until almost tender, about 10 minutes. Drain penne, reserving 1/2 cup of the starchy cooking water.

5 . Stage

Add the penne to the pan with the rapini. Add chicken, reserved cooking water, and chicken bouillon. Continue to cook until penne is tender yet firm to the bite, 2 to 3 minutes. Season with salt and pepper. Stir in 1/4 cup Parmigiano-Reggiano cheese. Divide among serving bowls and serve with remaining cheese.