Somewhere in Yorkshire

A couple are playing ‘I spy’ in the kitchen of their home somewhere in Yorkshire.
‘I spy with my little eye something beginning with T’ said the husband.
“Tea pot said the wife.” ‘Nay Lass!’
“Tea towel.” ‘Nay Lass!’
“Toaster.” ‘Nay Lass!’ he said, drumming his fingers on the work top.
“Oh I don’t know” she said at long last “I give in”
‘It’s easy’ he said. ‘It’s t’oven!’

T,what?