Probably echoing comments in here about overcooked veg, but I find that salmon and pickled vegetables go well together. They retain some crunch and have a tang that works well with the rice and protein. You can even steam them to temp and they’ll still taste great.

Im sure you can pickle peas and onions and shallot; but there are also other options like mustard greens.

Alternatively, if you want to stick with onions and peas, a simple ‘steam and sauté’ is all that’s really needed for a relatively simple meal.