Most Helpful Guy
Learn to cook at home before you go out. You see the problem, the solution is to spend less. You still need to eat though, why not have more stay in nights were you both dinner together? Or trade cooking dishes for one another? Still want to go out after? Then go, start dinner earlier so its done when you want to eat. Have a nice meal. Then clean up and go out after if you are still in the mood.
Most Helpful Girl
Well you can do a lot of things:
You can try splitting appetizers and meals between the two of you. I did this a lot in my youth since half of the time we wouldn't finish all of what we ate anyway
You can actually buy a few groceries/snacks between the two of you and MAKE food.
You can go to cheaper places to eat, or stop at one of those superstores and grab something like a sandwich and take it with you while you do something else.
Maybe eat before you go out and have a date that doesn't center around eating.
To name a few.