- Mix lemon zest, juice, sugar and butter in a saucepan.
- Put on the stove until butter is melted.
- Slightly, make sure it doesn’t boil as the eggs will curdle.
- Whisk the eggs and add to the saucepan.
- Stir over a medium heat until it thickens. Whisking and stirring, pour into a prepared tart shell.
- Pre heat the grill and place the tart with custard under the grill until black dots appear.
- Remove and cool down.
(Placing the tart under the grill will set the custard)