Main character accidently kills someone/hero/knight? using a trap meant for killing monsters, a page had the main character and other people with white carrots? Or is it.. they loved the "carrots" because it's like thighs.
Sounds like Yuusha ga Shinda! Murabito no Ore ga Hotta Otoshiana ni Yuusha ga Ochita Kekka. The main character, Touka Scott, is a raddish farmer obsessed with thighs. In the first chapter he likens a particular radish to an attractive thigh. He also crafts anti-demon traps in his fields.