Pantry Pasta Spaghetti with White Beans, Harissa, and Dill

 

Kosher salt

12 ounces spaghetti

4 T. unsalted butter

1 shallot, thinly sliced

2 tsp. harissa paste

1 (15-ounce) can cannellini beans, rinsed and drained

½ cup (packed) chopped fresh dill or other tender herb, such as flat-leaf parsley or mint, plus more for garnish

Freshly grated Parmesan, for serving (optional)

 

Bring a large pot of very salty water to a boil and add the spaghetti. Cook until just shy of al dente (you’ll finish cooking the pasta in a skillet). Meanwhile, in a large skillet set over medium-low heat, melt the butter. Add the shallot and cook, stirring frequently, until soft and golden, 5 to 6 minutes. (Resist any temptation to raise the heat, or the butter might burn.) Turn off the heat and stir in the harissa and beans. Reserve 2 cups of the pasta cooking water, then drain the spaghetti. Add the drained spaghetti to the skillet, along with the herbs, 2 tsp. kosher salt, and 1 cup of the reserved pasta water, and cook over medium heat, stirring the spaghetti almost constantly, until a silky sauce coats the noodles. If the skillet ever looks dry, add more of the reserved pasta cooking water, 1 T. at a time. Taste the spaghetti and add more salt if needed (depending on how salty your pasta water was, you could need up to a tsp. more). Serve the pasta in shallow bowls topped with more herbs and, if you’re using it, the Parm.