Sweet Potato Bowls with Spiced Lamb and Mushrooms

Name: Sweet Potato Bowls with Spiced Lamb and Mushrooms
Ingredients: 1 tsp. kosher salt, divided, plus more; 1 large sweet potato (about 1 lb.), halved lengthwise; ½ fennel bulb (about 6 oz.), thinly sliced, plus fronds (for serving; optional); ½ small red onion, thinly sliced; ¼ cup apple cider, coconut, or unseasoned rice vinegar; 3 Tbsp. extra-virgin olive oil, divided; ½ lb. ground lamb; 1 tsp. ground cumin; ½ tsp. ground cinnamon; 1 tsp. Aleppo-style pepper, plus more for serving; 8 oz. wild mushrooms (such as shiitake, oyster, chanterelle, porcini, hen of the woods, black trumpet), sliced into ¼ slices; ½ cup plain full-fat yogurt; 2 Tbsp. fresh lemon juice; ¼ cup mint leaves