To think this doesn't count as cooking me dinner

[IWantATardis]

Picture this scene:

DH has previously said he's cooking dinner tonight. Steak with accompaniments.

DH appears in the living room and announces that he's off to have a shower as he didn't have one this morning, he's set the timer on the oven to tell me when dinner's ready, and it'll go off in 18 mins.

I'm sat on the sofa breastfeeding DS3, so am not in an ideal position to be attending to the dinner and the steak that DH had left cooking in a frying pan on the hob.

AIBU to think that I shouldn't have had to tell DH to rethink his shower plans, when he'd volunteered himself to do dinner? DH clearly thought he'd done his bit by getting it started.

I'd order a pizza and let him eat his shoe leather steak when he gets out of the shower.

Surely it is a mortal sin to leave a steak unattended to cook on its own anyway (I only cook a steak for 5 mins and hover over it). YANBU.

I'd not be cooking for the selfish twat any time soon.

What happened in the end, OP?

Why didn't you speak up at the time?

Say: sorry? I thought we were having steak. How is that going to work if I'm bf'ing and you are going for a shower?

Are you in the UK? Did you agree to the 10.30/11 dinner time? If not, I would have given up and made myself an omelette hours ago.

Steak takes about 5 minutes to cook, if that. He could have been forgiven for cooking it and going for a quick shower while it rested, if covered up in a warm place so it didn't get cold, but what sort of steak takes 18 minutes in the oven? Or was that oven chips and roast veg?

So was it a nicely cooked meal which was ready in the 18 minutes without intervention by you or was it a disaster?
From the initial information provided it COULD be either.