Steamed Brussels Sprouts and Bacon

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Good olive oil

1/4 pound applewood smoked bacon, 1-inch diced

1 cup chopped yellow onion

1/2 cup sliced shallots (halved lengthwise and sliced in half-rounds)

12 ounces fresh Brussels sprouts, trimmed and quartered through the core

Kosher salt and freshly ground black pepper

1 tablespoon unsalted butter

1 tablespoon balsamic vinegar (not syrupy)

Fleur de sel