Pastasallad med mangold

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1. 1
   Cook 10 oz. ditalini or other small pasta in a medium pot of boiling salted water, stirring occasionally, until al dente, then drain.
2. 2
   Meanwhile, remove ribs and stems from 2 bunches Swiss chard; slice very thinly. Coarsely chop leaves; set aside. Heat ⅓ cup extra-virgin olive oil in a large skillet over medium-high. Cook chard ribs and stems, stirring occasionally, until lightly crisped, about 4 minutes. Add ½ cup coarsely chopped raw pistachios and remaining ⅓ cup extra-virgin olive oil and cook, stirring often, until nuts are golden brown, about 1 minute. Add 2 Tbsp. thinly sliced sage; cook, stirring, until crisp, about 30 seconds. Remove pan from heat, add reserved chard leaves, and stir until wilted and combined.
3. 3
   Pour chard mixture into a large bowl and stir in 2 garlic cloves, finely grated, ⅓ cup sherry vinegar or red wine vinegar, 2 Tbsp. coarsely chopped capers, ½ tsp. crushed red pepper flakes, and 1½ tsp. Diamond Crystal or ¾ tsp. Morton kosher salt; season with freshly ground black pepper. Add pasta and toss to combine, then mix in 5 oz. feta, crumbled.