A chairde,

Táim ag cuardú focail chun "roasting" a chur in iúl, ag caint faoi bia atáim. An frása ná

"...when he realises how hot the food is"

Níl mé ag iarraidh "te" nó "thar a bheith te" a úsaid. Dealraíonn sé dom go bhfuil "brothallach" níos oiriúnaí don aimsir (ach níl mé cinnte). Moladh ag éinne?

GRMA

Tá sé ag róstadh. It is roasting. (chicken etc.)
Tá mé róstaithe. I am roasting. (When feeling too hot)

Obviously comes from the English originally but it is not Béarlachas.

Go raibh maith agat a Bhríd!

Mar sin, nuair a thuigeann sé go bhfuil an bia róstaithe makes sense?

That translates as:
When he understands that the food is roasted.

Yes, if you want to use the word "roasted".
But why that word? The food could be cooked by other means. Bruite (boiled), and cócaráilte (cooked by whatever means).


Te - is really the best word for "hot".
.. nuair a thugann sé faoi dearadh cé chomh te is atá an bia/beatha.

Dhó sé é féin sular thug sé faoi dearadh cé chomh te is a bhí an bia/beatha.

Ní rósta go pósta....