1.

Put the ribs on a rimmed baking sheet and cover tightly with foil; bake at 300°F for 2 1/2-3 hours, until tender. (Ribs can be cooked up to this point and then wrapped in foil and refrigerated for up to 3 days.)

1.

Put the ribs on a rimmed baking sheet and cover tightly with foil; bake at 300°F for 2 1/2-3 hours, until tender. (Ribs can be cooked up to this point and then wrapped in foil and refrigerated for up to 3 days.)

2.

Meanwhile, stir together the hoisin sauce, vinegar, honey, garlic, ginger and hot pepper flakes.

2.

Meanwhile, stir together the hoisin sauce, vinegar, honey, garlic, ginger and hot pepper flakes.

3.

Remove the foil, turn the oven up to 425°F, brush the ribs with sauce and roast for another 10 minutes, until dark and sticky. (Alternatively, you could finish them on the grill over high heat for a few minutes.)

3.

Remove the foil, turn the oven up to 425°F, brush the ribs with sauce and roast for another 10 minutes, until dark and sticky. (Alternatively, you could finish them on the grill over high heat for a few minutes.)

4.

Sprinkle with sesame seeds and green onions.

4.

Sprinkle with sesame seeds and green onions.