1 large delicata squash (about 1 1/4 pound)
1 pound brussels sprouts, trimmed of ragged outer leaves and stem
3 large shallots, peeled, cut lengthwise in half or thirds
2 Tbsp olive oil
1 teaspoon Kosher salt (plus more to taste)
3 Tbsp pure maple syrup (divided 2 tbsp and 1 tbsp)
1 Tbsp apple cider vinegar
1/4 cup fresh pomegranate arils