Green Curry with Brown Rice Noodles and Swiss Chard

Name: Green Curry with Brown Rice Noodles and Swiss Chard
Ingredients: 4 scallions, coarsely chopped; 4 garlic cloves, smashed; 3 green Thai chiles, coarsely chopped; 1 (2-inch) piece ginger, peeled, coarsely chopped; 2 teaspoons green peppercorns in brine; 1/2 teaspoon ground turmeric; 2 cups cilantro leaves with tender stems, plus more for serving; 1/3 cup mint leaves, plus more for serving; 1/4 cup virgin coconut oil, melted, slightly cooled; 2 (13.5-ounce) cans unsweetened coconut milk; 1 tablespoon fresh lime juice; 1 lemongrass stalk, bottom third only, tough outer layers removed, bruised with the back of a knife; 4 cups coarsely chopped Swiss chard leaves (from about 1 1/2 bunches); 1 tablespoon coconut sugar or honey; Kosher salt; 8 ounces dried thin brown rice noodles; Lime wedges (for serving)