treat是否可数

有时可数有时不可数

Dessert

is something sweet, such as fruit, pastry, or ice cream, that you eat at the end of a meal.

泛指餐后甜点时不可数

e.g.Would you like some coffee or dessert?

特指某个时可数

e.g.Invite your honey and treat him to a dessert dish.