"食淨個D" seems not so good.. I usually ask her to 分左先 (we use 公快 too and very often only 我同工人兩個人食)...
eventually she or you will know you 食既份量... it's better to ask her to cook more at the beginning.. if 食淨, then she can either finish it or put it in the fridge for next day lor.
I had the same problem --> "未請工人之前, 晚晚叫外賣 or think of what to cook after work, 而家日日要諗買咩送, 買幾多份量.. 真係頭痛!"
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