suggestion from audience member at An Evening with Milton Hide on 13 Sept 2023, part of Hailsham Festival
Milton Hide have now written a song about this as part of the your Stories In Song project and it will be released on the project album. Video of a performance of the song below.
Gerri Walton has written a blog post about it: https://www.geriwalton.com/onion-pie-murder-in-1852-by-sarah-ann-french/
You can read all about it on Wikipedia: https://en.wikipedia.org/wiki/Onion_Pie_Murder#:~:text=The%20Onion%20Pie%20Murder%20occurred,his%20meal%2C%20an%20onion%20pie.
More here: https://www.capitalpunishmentuk.org/french.html
There’s an article in the Argus: https://www.theargus.co.uk/news/18451730.hard-swallow—story-sussex-onion-pie-murder/