Couches for couples to dine on pepper steak heart (3-7)

'pepper steak heart' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'couches for couples to dine' is the wordplay.
I cannot quite understand how this works, but
'couples' could be 'twos' (I've seen this in another clue) and 'twos' is found within the answer.
'dine' could be 'eat' (I've seen this before) and 'eat' is present in the answer.
The remaining letters 'ers' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'on' is the link.

Can you help me to learn more?