Using kitchen shears, remove the eyes and gills from the soft shell crabs. Brush the crabs with the olive oil and season with salt and pepper.
Prepare the grill. Cook the crab over direct high heat for a total of 8-10 minutes. Rotate the crabs a quarter turn after the first 3 minutes of cooking and gently flip them once while cooking.
While the crabs are cooking, also prepare the grilled onions. To serve, place one skewered onion on a plate, set the grilled crab on the onion and drizzle with the cucumber dressing.
Yield: 6 servings