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; 1/2 fennel bulb (about 6 oz.), thinly sliced, plus fronds (for serving; optional); 1/2 small red onion, thinly sliced; 1/4 cup apple cider, coconut, or unseasoned rice vinegar; 3 Tbsp. extra-virgin olive oil, divided; 1/2 lb. ground lamb; 1 tsp. ground cumin; 1/2 tsp. ground cinnamon; 1 tsp. Aleppo-style pepper, plus more for serving; 8 oz. wild mushrooms (such as oyster or shiitake), sliced into 1/4 slices; 1/2 cup plain whole-milk yogurt; 2 Tbsp. fresh lemon juice; 1/4 cup mint leaves