For the dressing: Mix the pesto and yoghurt in a small bowl. Add the water gradually, a teaspoon at a time, until you reach your desired consistency. It should be runny enough to drizzle over the salad but still creamy.
In a large bowl, combine the spinach, cooked pasta, sun-dried tomatoes, cucumber, cooked chicken, spring onion and almonds. Season really well. Drizzle over the dressing and serve.
1 cup baby spinach, 1 cup pasta, 1/2 cup sun-dried tomatoes, 1 lebanese cucumber, 1 cup cooked chicken, 3 spring onions, 1/4 cup slivered almonds, 2 tablespoons pesto, 3 tablespoons greek yoghurt