The nikujaga looks good! And miso is always delicious.

Just remember: the worst you can ever do is make it unpleasant to eat. No explosions or deaths (plausibly, anyway ), and your fiance won't call off the wedding for a bad dish. I know you're practicing a lot, but I know it's also under guidance/instruction. Though this is definitely helpful if you don't know the first thing about what you're doing, it can also provide a lot of pressure to do well. If you don't already, try making some meals by yourself, in your free time. That way if you mess up, you have no one to answer to about it but yourself. No embarrassment!