Whisk together the flour, milk and egg until you have a smooth batter. Leave to stand for 20 minutes. Line a dinner plate with baking parchment.
Put a 20cm non-stick frying pan over a medium heat. Add a little of the oil and swirl around the pan. Pour a ladleful of batter into the pan, swirling so the batter covers the base in a thin layer. Cook the pancake for 30 seconds to 1 minute, then flip it over and cook the other side. Remove from the pan on to the prepared plate.
Repeat with the remaining mixture until you have 8 pancakes, layering with a sheet of baking parchment between each one to prevent sticking.
Mash the ricotta with the icing sugar and grated orange zest. Spoon over the pancakes, then top with slices of fresh mango and a drizzle of honey.