Mashed Boniato with Onions (Pure de Boniatos con Cebollas)

Ingredients

• ¼ cup roasted garlic (see note)
• 2 cups heavy cream
• ¼ cup sherry vinegar
• 1 ½ cups thinly sliced red onions
• 2 tablespoons vegetable oil
• Salt and freshly ground black pepper
• 1 ½ pounds red-skinned potatoes
• + 1 more ingredients
• • 1 ½ pounds boniato (tropical sweet potato)

Peel the boniato and the red potatoes and chop them into large pieces; place each in a separate container of water. Fill two medium saucepans with water and bring to a boil over high heat. Add some salt and cook the boniato and the potatoes separately until fork tender. In a medium sauté pan ...

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