Cook the lentils in boiling water until tender.
Cook the pasta in a large quantity of boiling water until just tender.
While they are cooking melt the butter in a pan. Add the nutmeg and onion and cook over a gentle heat until the onion is soft. Add spinach, cover and cook until the spinach is just tender.
Drain the lentils, add the lemon juice; stirring to combine.
Drain the pasta. Combine the lentils, pasta and spinach. Place on a serving plate and sprinkle with pine nuts. Serve immediately.