This was the approach my current employer chose. They basically were like "Here's the challenges we expect you to tackle once you start. Let's discuss how you would approach each."

Essentially a high-level design session where they got to see my thought process and I got to ask lots of questions about the firm. The best part is that when I started they were pretty comfortable with my approach to certain projects as it was previously covered, and I knew what I was getting into. No big surprises for either side.