Ricotta and Spanish cake

Ingredients: 599 g /1lb 2 oz/4 ½ cups spinach washed 1 clove garlic crushed 40 g/ 1 ½ oz/1/2 stick vegan butter 300 g/10 ½ oz/ 2 cups plain (all-purpose) gluten free flour (optional) 5 vegan eggs 200 g/7 oz/1 ½ cups vegan ricotta 150 g /3 oz /1 ½ cups vegan Parmesan Nutmeg grated