After months of brainstorming how to have the most delicious wedding cake possible, Rachel Karten and Roxanne Rosensteel, a pastry chef based in Santa Barbara, California, concluded that only one kind of wedding cake could fit the bill: a big sheet cake.

The original plan was to have four of them, but when Karten, the former head of social media at Bon Appétit, saw a metre-long cake at designer Sandy Liang’s wedding in June, she asked Rosensteel if it might be possible to combine four sheet cakes into one.