A Spinach Filling for a Pastry Flan

• 2 pounds of spinach
• 1 finely chopped onion
• 2 ounces of grat

Having prepared the spinach, half cook it in the minimum of water, drain it well and chop it up, or put it through a moulin légumes. Warm the butter in a pan and cook the chopped onion in it until it is melted and golden. Sprinkle the flour onto the butter and onion and cook all together for, say, 3 minutes, stirring all the time to prevent the flour from colouring or burning. At the sam