Sweet Potato Shakshuka with Spicy Butter and Pickled Onions

Ingredients

• 2 pounds sweet potatoes, skin on and scrubbed clean
• 1 small red onion, thinly sliced into rounds (3½ ounces)
• 2 tablespoons freshly squeezed lemon juice, divided
• 3 tablespoons olive oil, divided
• 1⅓ cups coarsely grated mature cheddar
• 3 cloves garlic, minced
• 1 teaspoon cumin seeds, roughly crushed with a mortar and pestle
• 8 large eggs
• 2 tablespoons unsalted butter
• 2¼ teaspoons Sriracha
• 2 tablespoons cilantro leaves, with some stem attached
• salt and freshly ground black pepper