Grilled Mushroom and Scallion Pasta

Heat grill to medium-high. Cook pasta per package directions. Reserve 3/4 cup pasta cooking water, then drain pasta and return to pot.

Meanwhile, in large bowl, toss mushrooms and scallions with oil and 3/4 teaspoon salt. Grill, turning occasionally, until charred and just tender, 2 to 3 minutes for scallions and 5 to 8 minutes for mushrooms (depending on size). When cool enough to handle, cut scallions into 1-inch pieces and halve mushrooms (quarter if large). Grill lemon (if using), cut sides down, until nicely charred, to serve alongside pasta.

Finely grate garlic over hot pasta and toss to combine. Toss with nutritional yeast, 1/2 teaspoon each salt and pepper, and 1/2 cup reserved pasta water, adding more if pasta seems dry. Add mushrooms and scallions, then toss with pasta. Sprinkle with cracked pepper and serve with lemon halves.