One is biscuit / biscotti, which literally means "twice cooked", although the prefix here is "bis", it does start with "bi", so...

from Oxford Living Dictionary:

Origin

Middle English: from Old French bescuit, based on Latin bis ‘twice’ + coctus, past participle of coquere ‘to cook’ (so named because originally biscuits were cooked in a twofold process: first baked and then dried out in a slow oven so that they would keep).

One is biscuit / biscotti, which literally means "twice cooked". Although the prefix here is "bis", it does start with "bi", so...

from Oxford Living Dictionary:

Origin

Middle English: from Old French bescuit, based on Latin bis ‘twice’ + coctus, past participle of coquere ‘to cook’ (so named because originally biscuits were cooked in a twofold process: first baked and then dried out in a slow oven so that they would keep).