Prepare a grill or a grill pan and heat to medium-high heat.
Make the super sauce: Stir together the ketchup, maple syrup, hot sauce, soy sauce and vinegar. Using a chef?s knife, mash the garlic to a paste with 1/4 teaspoon salt and stir into the sauce.
Lightly sprinkle the salmon with salt and pepper. Brush half of the sauce on the salmon. Grill, flipping once and brushing the salmon with the remaining sauce, until grill marks appear and the fish is just cooked through, about 6 minutes.
Toss the scallions with the oil, 1/4 teaspoon salt and a couple turns of pepper. Grill, flipping once, until charred and slightly wilted, 1 to 2 minutes.
Serve the salmon with the scallions.
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