In a food processor, combine the avocado, garlic, salt, pepper, green onions, Essence, and lemon juice and process until smooth. With the machine running, slowly add the olive oil through the feed tube and process until well combined. Taste and re-season with salt and pepper, if necessary. Set aside.
In a large bowl, combine the bibb lettuce, radicchio, and frisee. Add some of the dressing and toss well. Top with sliced cheese and serve immediately.
Yield: 4 servings