So-Cal Sweet Potato and Potato Gratin Recipe | Valerie Bertinelli | Food Network

Ingredients

• 3 poblano peppers
• Unsalted butter, for the baking dish
• 2 cups heavy cream
• 1 1/2 teaspoons kosher salt
• 1 teaspoon finely grated lime zest
• 1/2 teaspoon ground cumin
• 1 garlic clove, finely grated
• 3 sweet potatoes
• 2 russet potatoes
• 1 cup crumbled Cotija