1. On their last evening, Mrs. Weasley conjured up a sumptuous dinner that included all of Harry's favorite things, ending with a mouthwatering treacle pudding.

Conjure up: 用魔法召唤

I hope I can conjure up a angel.

Sumptuous: 奢华的

I think it's a sumptuous palace.

A mouthwatering treacle pudding:令人垂涎的蜜糖布丁

The advertisement shows a piece of mouthwatering cookie.

2. round off

使圆满

The last dish rounded off this dinner.