bacon是不可数名词，不可加不定冠词。若表示数量，可加a piece〔strip〕 of或some。

We had bacon and eggs for breakfast.我们早餐吃咸肉和煎蛋。
Would you like some bacon for breakfast?早餐吃点咸肉如何？
A kilo of bacon, please.请来一公斤咸肉。
I bought two strips of bacon this morning.今天早晨我买了两块咸肉。

［词源］＜古法语bacon(烟熏猪肉)