Smoky Greens

Directions

1. 1
   Wash the greens thoroughly in cold water and coarsely chop the leaves; do not dry them.
2. 2
   Heat the duck fat in a large, heavy stockpot.
3. 3
   Add the chopped onions and cook over moderately high heat, stirring often, until softened, about 7 minutes.
4. 4
   Add the garlic and cook, stirring, until fragrant, about 3 minutes.
5. 5
   Stir in the greens by the handful, adding more as the previous batch starts to wilt.
6. 6
   Add the chipotles and season lightly with salt and pepper.
7. 7
   Cover and cook over low heat, stirring often, until the greens are very tender, about 1 hour.
8. 8
   Discard the chipotles if using dried.
9. 9
   Stir in the vinegar and season with salt and pepper.
10. 10
    Transfer the greens to a bowl and pass the Tabasco at the table.