BBC Good Food Cheese Club
Read about the all-new BBC Good Food Cheese Club. Curated cheese, delivered straight to your door.
Heat oven to 200C/fan 180C/gas 6, then toss the potato chunks with the oil and some seasoning on a baking sheet. Roast for 20-30 mins until golden and crisp on the outside, then leave to cool.
To serve, mix the mayonnaise with the lemon juice. Pile a scrunched up piece of ham on each potato, then top with a blob of the lemony mayo. Arrange on a platter with the watercress, then serve.