Lighter spanakopita

Name: Lighter spanakopita
Ingredients: 500g fresh spinach; 3 tbsp rapeseed oil; 1 shallot finely chopped; 6 spring onions ends trimmed, finely chopped; 2 garlic cloves finely chopped; generous pinch of ground nutmeg; 200g ricotta; 1 large egg beaten; 2 tbsp chopped dill plus 1 rounded tsp; 2 tbsp snipped chives; 2 tsp chopped mint; 5 sheets filo pastry (each about 46 x 25cm and about 250g total weight); 100g feta; minted yogurt dip (see tip), to serve (optional); tomato, cucumber & pepper salad (see tip), to serve (optional)