topping; extra portion on top; what's placed on top
Refers to an additional serving placed on top of a dish, or the act of adding it. Commonly used in food contexts, such as extra rice, meat, or toppings.
I ordered extra chashu on top of my ramen.
An extra portion of rice on top is free.
Compound of 上 (うわ, 'top') and 盛り (もり, 'serving'). The reading うわ is a common prefix meaning 'upper' or 'top'.