Preheat the oven to 200°C.
In a mixing bowl, combine the milk, eggs, and sugar.
You’ll need to mix vigorously at this stage so that the eggs emulsify with the milk and sugar. Otherwise, the topping won’t spread evenly over the tart. If you don’t feel strong enough to do this with a whisk, you can use a blender or a shaker to create this emulsion!