For this combination logo, I used elements representing London in the top half, and a cacao fruit in the bottom half. The full mark is framed in a square/diamond — like a piece of chocolate. It's designed to print nicely on packaging, with the rotated square fitting dynamically on a rectangular block of chocolate.
I picked Baskerville for the main typeface as it's elegant, but the serifs have a "gooey" quality to them to give it a melting chocolate feel.