My non diabetic wife does most of the cooking and cooks what she wants to eat. I try to make my low carb requirement as little extra work as possible so, whenever possible, I just modify what she is having. If she is doing a roast dinner with roast potatoes I cut up some butternut squash and stick it in with the potatoes. If she is doing a curry with rice, I microwave a pack of cauliflower rice. If she is making a pasta dish I make some courgetti. You get the idea. Of course it doesn't always work, some meals like paella you can't leave out the carbs so I have something else. It would be more difficult if I was keto rather than moderately low carb.