Remove strings and tips from fresh peas. Cook fresh peas, covered, in a small amount of boiling salted water for 2 to 4 minutes or until crisp-tender. (Or, cook frozen peas according to package directions.) Drain well.
Meanwhile, in a small saucepan cook ginger in hot butter for 1 minute. Stir in marmalade, vinegar, and pepper; cook and stir until marmalade melts. Pour marmalade mixture over hot cooked peas; toss to coat.