Working in batches, place the Brussels sprouts in the feed tube of a food processor fitted with a thin slicing disk and slice. (If you don’t have a food processor with a thin slicing disk, thinly slice the Brussels sprouts by hand.) Zest the orange, then squeeze 1/4 cup of orange juice (save any remaining orange for another use). Set Brussels sprouts, orange zest, and orange juice aside.
In a large saucepan or small stockpot over medium heat, warm the olive oil. Add the ham and cook, stirring occasionally, until crisped and golden, 3 to 4 minutes. Use a slotted spoon to transfer ham to a plate and set aside.
Add the butter to the pan and melt over medium heat. Add the shallots and cook, stirring occasionally, until almost translucent, about 3 minutes. Add the garlic and cook, stirring occasionally, for 1 minute. Stir in the Brussels sprouts. Stir in the orange zest and orange juice and cook, stirring occasionally, until Brussels sprouts are tender, about 8 minutes. Remove from the heat and stir in the pine nuts and vinegar. Season with salt and pepper.
Transfer the mixture to a serving bowl, top with the ham, and serve.
Yield: 8 servings