seva: dip morsel of sadza into side-dish
temura: eat sadza without any side-dish
Eating up the relish too fast will leave you with no relish for the sadza.
Sadza is always served with a side dish, otherwise, it is unpalatable. Nzuwu refers to sadza that remains on the plate without any more relish to go with it.
Being wasteful or careless deprives one of resources that could have been available for use in the future.