1. Warm oil in a small skillet over medium heat. Cook onion, stirring, until just tender, about 1 minute. Stir in curry powder and sauté for 30 seconds. Transfer to a small bowl and let cool.
2. In a food processor, combine yogurt, avocado and lemon juice. Add onion mixture and process until smooth and creamy. Season with salt and pepper. Cover and refrigerate for at least 2 hours before serving. Serve cold with assorted crudités.
Note: Nutritional analysis is for dip only.