Step 1

Combine capers, olives, shallots, peppers, basil, scallion, anchovy, honey, lemon juice, and vinegar in a medium bowl. Whisking constantly, add olive oil in a thin steady stream. Season to taste with salt and pepper. Set aside

Step 2

Press salmon filets between paper towels to dry surfaces thoroughly. Season on all sides with salt and pepper.

Step 3

Heat oil in a large stainless steel skillet over medium-high heat until shimmering. Reduce heat to medium low, then add one salmon filet, skin-side-down. Press firmly in place with the back of the spatula for 10 seconds to prevent the skin from buckling. Add the remaining filets one at a time, pressing each on until they are all in the pan.

Step 4

Cook, pressing gently on back of filets occasinally to ensure good contact with skin, until skin releases easily from pan, aboug 4 minutes. If skin shows resistance when attempting to lift a corner with the spatula, allow it to continue to cook until it lifts easily. Continue to cook until salmon registers 110°F (43°C) in the very center for rare, 120°F (49°C) for medium-rare, or 130°F (54°C) for medium, 5 to 7 minutes total.

Step 5

Flip salmon filets and cook on second side for 15 seconds, then transfer to a paper towel-lined plate to drain. Set aside.

Step 6

Meanwhile, place bok choy on a large microwave-safe plate and cover tightly with plastic wrap. Microwave on high power until just wilted, about 1 1/2 minutes. Carefully remove plastic (steam will burst out), season to taste with salt and pepper, then transfer to serving platter. Lay salmon on top skin side-up and spoon relish over the salmon. Serve immediately.