1. First, prepare a cake with seven flowers (below, use a circle with seven flowers to represent the cake to introduce the specific cutting method).

2. Cut a knife diagonally from the upper right corner to the lower left corner, as shown in the figure.

3. After the first knife is cut across the board, cut the second knife diagonally from the upper left corner to the lower right corner, as shown in the figure.

4. After the second knife is cut, cross-cut a knife below, as shown in the figure.