Roast the sweet potatoes: Preheat the oven to 325º. Season the potatoes with salt and wrap in foil. Place on a baking sheet and roast until tender, 45 minutes to 1 hour. Once the potatoes are cool enough to handle, peel them and cut into ¼-inch rounds.
While the sweet potatoes are roasting, make the mint chutney: In a blender, combine the mint, cilantro, yogurt, lime juice, shallot, sugar, half of the serrano and salt. Purée until smooth and transfer to a medium bowl. Stir in the remaining serrano chile and the rest of the chutney ingredients to incorporate, then set aside.
In a large bowl, combine the roasted sweet potatoes with the remaining ingredients and toss to coat. Transfer to a platter and spoon the mint chutney over top. Garnish with sev and pomegranate seeds, then serve.