I ran a DnD campaign once were two cultures practiced different variations of ritual cannibalism. One used their dead family members as fertilizer, the other straight up ate them. It was combined with ancestor worship and both cultures had a heavy focus on family and heritage. It was a great honor to be invited to dine on a family member, the more people that dined on a person the more prestigious they were. Eating veggies grown on someone was likewise seen as a great honor.
The cultures also fucking hated each other, like scots and other scots lol.
It took place in a world were space was at a premium, so no burial sites were really available, which led to people getting very intricate funeral rites. Only the wealthy got buried.