1. In a large skillet, heat 1 tablespoon oil over medium-high. Add potatoes, carrots, and onion and season with salt and pepper. Cook, stirring occasionally, until vegetables are tender, 12 to 15 minutes. Add beans and vinegar and cook 1 minute. Remove from heat and stir in parsley.

2. Meanwhile, spread flour on a large plate. Season fish with salt and pepper, then dredge in flour, brushing off excess. In a large nonstick skillet, heat 1 tablespoon oil over medium-high. Add fish and cook until underside is golden and crisp, about 5 minutes. Flip and cook until fish is opaque throughout, about 3 minutes. Serve with bean hash and lemon wedges.