Preheat the oven to 200ºc/180ºc fan and grab a large baking dish
Drain the peaches into a bowl and add the sugar, flour, cinnamon, lemon zest and juice and mix to combine
Pour into dish and smooth over
Add the flour, sugar and butter to a new bowl
Rub together with your fingertips so the mixture resembles breadcrumbs
Sprinkle over the peach base evenly
Bake in the oven for 35-40+ minutes until golden, and serve
