Cut the cucumbers in half lengthwise and then slice across the width into 1/2-inch half moons. Sprinkle with salt and let sit in a colander for 20 to 30 minutes. Combine the cilantro, Achiote, orange juice, lime juice, garlic and peppercorns in a blender. Puree until smooth. Cut the swordfish into 1 1/2-inch chunks and place in a nonreactive bowl. Pour over the cilantro marinade and let sit 20 to 30 minutes. Preheat the grill or broiler. Grill chard, transfer to a large bowl and toss with lime dressing. Thread alternating swordfish and cucumber chunks on skewers. Grill or broil about 1 1/2 minutes per side. Line a serving platter or plates with the chard. Top with the skewers and serve.
LIME OLIVE OIL DRESSING
Whisk together the olive oil, lime juice, salt and pepper. Serve.