Spinach Tart

Ingredients

• 220 g plain flour
• ½ tsp baking powder
• 1 tsp sugar
• ½ tsp salt
• 125 g cold unsalted butter
• 60 ml water
• 2 tbsp olive oil
• 1 onion (finely chopped)
• 2 spring onions
• 400 g spinach
• ¼ tsp pepper
• 150 g ricotta cheese
• 100 g cream cheese
• 160 g feta cheese
• 1 egg
• 2 tbsp dill
• 1 tsp lemon zest