Heat oil in heavy large pot over medium-high heat. Add onion; saute until tender, abut 4 minutes. Add remaining vegetables; saute until deep golden brown, about 7 minutes. Add stock and bay leaves; bring to boil. Reduce heat to medium, cover and simmer until vegetables are very tender, about 35 minutes. Cool slightly. Season with salt and pepper. Drizzle with truffle oil. Puree soup with an immersion blender and serve in warm bowls. Garnish with chives and Essence. Serve immediately.
Combine all ingredients thoroughly.
Recipe from "New New Orleans Cooking", by Emeril Lagasse and Jessie Tirsch, published by William Morrow, 1993.