Broccoli with Orange Sauce

2
bunches baby broccoli (about 1 pound), untrimmed
1/2
cup fresh orange juice
2
shallots, halved lengthwise and thinly sliced
1
teaspoon balsamic vinegar
1/4
teaspoon red pepper flakes
 
In a large pot of boiling salted water, cook broccoli until just tender, 12 to 15 minutes; drain. Transfer to a serving bowl. Meanwhile, in a small skillet, combine orange juice, shallots, vinegar and pepper flakes, simmer over medium heat until reduced to 1/4 cup, about 3 to 4 minutes. Spoon sauce over baby broccoli toss gently.