Meanwhile, in a small bowl, whisk together mustard, honey, and seasoning. It will be a thick sauce.
Rub fish with oil, season with salt and pepper. Spread top with about 1⁄3 of the sauce. Place on grill, non-sauced side down. Barbecue, with lid closed, 2–3 min.
Gently flip and spread the other side with another 1⁄3 of the sauce. Barbecue 2–3 min.
Flip once more and spread remaining sauce on top. Grill an additional 1–2 min, until desired doneness.
Per serving: Calories 150, Fat 3 g (Saturated 0.3 g, Trans 0 g), Cholesterol 50 mg, Sodium 290 mg, Carbohydrate 11 g (Fiber 0 g, Sugars 8 g), Protein 20 g.
Don’t let grilling fish intimidate you! Fish is delicate, start with a clean grill to prevent sticking and make sure to choose fish fillets that are at least 1” thick. Firm fleshed fish like salmon, trout, cod, or snapper are excellent choices.