Ingredients

  • 2/3 cup boiling water
  • 1/2 ounce dried porcini mushrooms
  • 1 tablespoon canola oil
  • 1 1/2 cups chopped onion
  • 3/4 cup finely chopped carrot
  • 2/3 cup finely chopped celery
  • 8 ounces cremini mushrooms, finely chopped
  • 6 garlic cloves, minced
  • 6 ounces 90% lean ground sirloin
  • 3 tablespoons unsalted tomato paste
  • 1 teaspoon dried oregano
  • 3/4 teaspoon kosher salt
  • 1/4 teaspoon crushed red pepper
  • 2 (8-ounce) cans unsalted tomato sauce
  • 12 ounces peeled butternut squash
  • 4 ounces whole-grain spaghetti (such as Barilla)
  • 1/3 cup finely chopped walnuts, toasted
  • 1 ounce Parmigiano-Reggiano cheese, shaved (about 1/4 cup)

Method

  • Pour boiling water over porcini in a small bowl; let stand 15 minutes. Remove porcini with a slotted spoon; finely chop porcini, and reserve soaking liquid.
  • Heat a large skillet over medium heat. Add oil to pan; swirl to coat. Add onion, carrot, and celery; cook 5 minutes, stirring occasionally. Add cremini mushrooms and garlic; cook 6 minutes or until mushroom liquid evaporates, stirring occasionally. Add beef; cook 3 minutes, stirring frequently. Add tomato paste; cook 1 minute, stirring constantly. Stir in porcini, oregano, salt, pepper, and tomato sauce; pour in porcini liquid, stopping before grit at bottom of bowl reaches sauce. Bring to a boil; reduce heat, and simmer, uncovered, 12 minutes or until thickened, stirring occasionally to keep sauce from sticking.
  • Run squash through a spiralizer to create noodles, or cut into long noodles with a julienne peeler; set aside. Cook pasta according to package directions, omitting salt and fat, and adding butternut noodles during last 2 minutes of cooking time. Drain.
  • Stir walnuts into sauce; spoon over pasta mixture. Sprinkle with cheese.