More Room Available For

I had my lunch at Chinese restaurant. It was sort of big one and I became very full though...
この日の昼食は、沢山の中華料理でお腹いっぱいになったのですが・・・

I felt like to have some sweets anyway....
We call it "betu-bara" in Japan.
It means; there are still more room available for sweets even though you're full.  
それでもまだ甘いものが食べたくなる・・・
別腹ってことで。

Why not?!
もちろん食べましたよ！