Place broccoli florets in a steamer basket over boiling water, and cook 7 minutes or until crisp-tender.
Meanwhile, in a medium skillet, bring vinegar and shallots to a boil; reduce heat, simmer 7 minutes or until vinegar is almost absorbed. Remove from heat; add butter, a few pieces at a time, stirring constantly with a wire whisk until butter melts and sauce thickens. Stir in parsley, salt, and pepper. Toss with steamed broccoli.
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