Cut broccolini stems in half crossways. Wash florets and place in a single layer, with water clinging, in a microwave-safe sealable plastic bag. Cook on High/800watts/100% for 1 minute or until bright green and tender crisp. Refresh under cold running water. Drain. Spread hummus over the base of a small dish. Arrange the broccolini in the hummus to make trees. Sprinkle alfalfa sprouts around the broccolini trees to serve.