Ingredient: large onion, cut into 2-inch pieces

How To Prepare
1
Fit a food processor with the steel blade attachment. With the motor running, drop garlic through the feed tube and process until minced, then add mushrooms and process until finely chopped. Turn it off, add onion, and pulse until roughly chopped.
2
Cook beef in a large straight-sided skillet or Dutch oven over medium-high heat, breaking it up with a wooden spoon, until no longer pink, 3 to 5 minutes. Stir in the chopped vegetables, thyme, and pepper and cook, stirring often, until the vegetables start to soften and the mushrooms release their juices, 5 to 7 minutes.
3
Stir in water, 1 1/2 cups broth, noodles and Worcestershire sauce; bring to a boil. Cover, reduce heat to medium and cook, stirring occasionally, until the pasta is tender, 8 to 10 minutes.
4
Whisk flour with the remaining 1/4 cup broth in a small bowl until smooth; stir into the hamburger mixture. Simmer, stirring often, until the sauce is thickened, about 2 minutes. Serve sprinkled with parsley (or chives), if desired.