Place haricots verts in microwave-safe dish and drizzle with water. Microwave on high for 3 to 4 minutes and chill haricots verts in refrigerator for 10 to 15 minutes. In a small bowl, combine sour cream, cream, truffle oil, salt, and lemon juice and mix thoroughly. Add chilled haricots verts to sour cream mixture and toss to coat. Serve chilled.