Heat a small frying pan until hot, add the pumpkin seeds and dry-fry for 1–2 minutes, stirring occasionally, until golden.
Make the dressing by placing all the ingredients in a food processor and blending them until smooth. Season to taste.
Place the chicken, onions, tomatoes, pumpkin seeds and salad leaves in a salad bowl and toss together. Drizzle over the dressing and serve with crusty bread.