Preparation Coarsely chop greens, then cook in 2 batches in a 6- to 8-quart pot of boiling salted water , uncovered, stirring occasionally, until wilted and tender, about 5 minutes. Transfer with a slotted spoon to a large bowl of cold water to stop cooking. Drain greens in a colander, pressing gently to release excess moisture. Cook bacon in a 12-inch heavy skillet over moderate heat, stirring, until crisp, 4 to 5 minutes. Transfer with a slotted spoon to paper towels to drain, reserving fat in skillet. Add oil, chipotle, greens, and salt to fat and cook, stirring occasionally, until heated through, 2 to 3 minutes. Transfer to a serving dish and sprinkle with bacon. Cooks' note:Greens can be boiled 1 day ahead and chilled in a sealed plastic bag.
Preparation Coarsely chop greens, then cook in 2 batches in a 6- to 8-quart pot of boiling salted water , uncovered, stirring occasionally, until wilted and tender, about 5 minutes. Transfer with a slotted spoon to a large bowl of cold water to stop cooking. Drain greens in a colander, pressing gently to release excess moisture. Cook bacon in a 12-inch heavy skillet over moderate heat, stirring, until crisp, 4 to 5 minutes. Transfer with a slotted spoon to paper towels to drain, reserving fat in skillet. Add oil, chipotle, greens, and salt to fat and cook, stirring occasionally, until heated through, 2 to 3 minutes. Transfer to a serving dish and sprinkle with bacon. Cooks' note:Greens can be boiled 1 day ahead and chilled in a sealed plastic bag.