1. In a small bowl, whisk together the orange juice, chile, olive oil, ½ tablespoon of the zest, salt, and pepper.
2/ Peel avocado and cut into thin slices (but not so thin that they fall apart). Arrange them on a servings platter and drizzle the dressing over the top. Taste a piece and adjust seasoning, if necessary. Sprinkle the remaining zest around the edges of the plate.