The royal bakers have revealed they are abandoning the tradition of a tiered wedding cake – and teased of a surprise unveiling on the day.
Claire Ptak, who is making the culinary centrepiece, said the layered lemon and elderflower cake will be in three parts of varying sizes.
The final design will be unveiled on the big day, with the couple in on the plans, but it will be unveiled in a non-traditional way, she said.
“You’ll have to wait and see on the day. It’s an installation of the way that we’re putting it out. It’s the last thing that we’ll reveal. It’s a non-traditional layout,” Ms Ptak said.
It’s a slight shift from tradition.
She said: “They loved it. They tried quite a collection. What they said to me is that they really loved the idea of the seasonality and the freshness.”
Ms Ptak described the flavour of the cake as being a balance of sweet and tart, combined with “ethereal” elderflower.
The layers are sandwiched with buttercream and lemon curd.
Ms Ptak, who is American like Ms Markle, said: “The elderflower is so quintessentially British to me as a Californian.
“It’s of this moment. It’s May so they’re just opening this week.
Slices of the cake will be served to the 600 guests at the lunchtime reception in St George’s Hall after the ceremony. They will be served with edible rose petals.