Chicken piccata is more well-known, but the flavors of piccata sauce, made with lemon juice and capers, are a perfect match for fish. This is a revised version of an older recipe that featured tilapia - feel free to use any type of fish you prefer.
Toss green beans with red pepper flakes, vinegar, oil (portion for green beans), and some salt and pepper. Spread out onto a sheet pan and roast until tender and brown in spots, ~20 minutes, shaking the pan halfway through cooking.
While green beans roast, dredge salmon in flour mixture, shaking off any excess.
Heat a large skillet or saute pan over medium-high heat. Add oil (portion for salmon) and then arrange fish in heated oil. (Note: Cook salmon in batches if the pan cannot hold all of the fish at one time.)
Cook fish on both sides until golden brown and cooked through, 6 to 10 minutes total, depending on thickness. Set salmon aside on a plate.
Return to heated pan (if the pan looks dry, add a splash of oil) and add second portion of flour, shallots, and oregano. Saute until no dry spots of flour remain, ~2 minutes.
Add stock, wine, lemon juice, and capers to the heated pan, scraping up any brown bits. Simmer sauce until it thickens, 4 to 6 minutes.
Remove pan from heat. Stir butter and parsley into sauce and add salmon back to pan, spooning sauce over top. Taste and season with some salt and pepper.
If pasta was made ahead, reheat in the microwave.
Serve salmon and sauce over pasta with green beans on the side. Enjoy!