Different kinds of beans cook at different rates, so it's best to prepare them in separate pans (working in batches if necessary). The salad can be made with just a few types instead of all five, as long as the total amount of dried beans still measures 2 1/2 cups.
Sauteed leek, celery, and carrot form a flavorful base; potatoes add heft; and Parmesan rind makes the broth luxurious and savory. But the real stars of the dish are asparagus, English peas, and sugar snap peas, each contributing seasonal flavor to every spoonful.
Blanched English peas are scattered around a simple roasted side of wild salmon. Beurre blanc, served on the side, is essentially a warm vinaigrette made with butter instead of oil. Finish with a sprinkling of chives and -- if you have them -- a few flowering pea shoots.