Green Beans w/ Crispy Pancetta, Mushrooms, Shallot

Kosher salt
1-1/2 lb. green beans, trimmed
2-1/2 oz. thinly sliced pancetta (five or six 1/16- to 1/8-inch-thick slices)
3 Tbs. extra-virgin olive oil
6 medium cremini mushrooms, trimmed, halved if large, and very thinly sliced
2 medium-large shallots, halved lengthwise and very thinly sliced
1/4 cup very thinly sliced fresh sage leaves
1 Tbs. sherry vinegar
1/2 tsp. Dijon mustard

Fill a large mixing bowl with ice cubes and water and set aside. Fill a 6- or 7-quart pot two-thirds full of well-salted water. Bring the water to a boil and boil the beans uncovered until tender to the bite, 4 to 6 minutes. Drain, transfer to the bowl of ice water, and let sit until cooled, about 2 minutes. Drain and pat dry.

Put the pancetta in a 12-inch nonstick skillet and cook over medium-low heat until crisp and browned, 10 to 12 minutes. Transfer to a paper-towel-lined plate and coarsely crumble. Remove the pan from the heat and let it cool slightly.

Add 2 Tbs. of the olive oil to the pan and return it to medium-high heat. Add the mushrooms, shallots, and 1/4 tsp. salt and cook, stirring frequently, until both are nicely browned and shrunken, about 5 minutes. Add the sage and cook, stirring, until fragrant, about 30 seconds. Take the pan off the heat and add the vinegar, mustard, and the remaining 1 Tbs. oil. Stir to combine.

Return the pan to medium heat, add the green beans and toss to combine and heat through, 2 to 3 minutes. Season to taste with salt. Transfer to a warm serving platter and garnish with the pancetta.

nutrition information (per serving):
Calories (kcal): 110; Fat (g): 8; Fat Calories (kcal): 70; Saturated Fat (g): 1.5; Protein (g): 3; Monounsaturated Fat (g): 5; Carbohydrates (g): 8; Polyunsaturated Fat (g): 1; Sodium (mg): 410; Cholesterol (mg): 5; Fiber (g): 3;