Potatoes, salmon, a little mustard vinaigrette and voila! Dinner is served.
Boil potatoes; let cool, then halve. Season salmon fillets and cook in a lightly oiled nonstick skillet over medium-high until opaque throughout, 3 to 4 minutes per side. Flake into large pieces and toss with potatoes and cucumber; dress with oil, vinegar, and mustard; season.