First things first... Users.
When I received my prompt I started off with an extensive audit of my competitors. Typically a task for later in the project. But I knew so little about cakes and pastry that I wanted to learn as much as I could right from the start. This has also helped me to spot areas that had potential for improvement later in my own designs. I then went into the first round of research. Many of my friends and family members have volunteered to participate in user interviews, so that I was able to gather great insight and finally come up with a user persona.