Season steak with 3/4 tsp (4 mL) each salt and pepper. Heat a lightly oiled heavy skillet on medium-high heat. Cook steak 5 to 6 min. per side for medium (or preferred doneness). Rest for 10 min., then slice thinly.
Meanwhile, peel and segment grapefruit and orange over a bowl to capture any juice. Whisk 2 tbsp (30 mL) of the collected juice with the vinegar, garlic, ginger paste, mustard, honey and remaining salt and pepper until combined. Drizzle in oil while continuing to whisk.
Toss spinach, fruit and warm steak together with the dressing and garnish with pomegranate seeds. Serve with crusty bread, if desired.
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