Prepare all ingredients: pat dry the salmon and shrimp, slice the cucumber, and set up a small bowl with lemon juice, olive oil, salt, and pepper for the dressing.
Season the salmon and shrimp lightly with salt and pepper.
Heat a non-stick skillet over medium-high heat. When hot, add the salmon fillet and sear for about 2-3 minutes per side until just cooked through. Remove and keep warm.
In the same skillet, lightly sauté the shrimp for about 2 minutes per side until pink and opaque. Remove from heat.
In a separate pan, scramble the egg whites on medium heat until just set, seasoning lightly with salt and pepper.
Briefly steam the rice until warm if not already pre-cooked.
Prepare the cucumber salad by tossing the sliced cucumber with the lemon dressing.
Plate the dish by placing the steamed rice as a base, top with the seared salmon, arrange the sautéed shrimp and a serving of scrambled egg whites alongside, and finish with a generous helping of cucumber salad.