01 -
Set oven to 400°F (200°C) and lightly grease a baking dish with olive oil.
02 -
Whisk melted butter, grainy mustard, soy sauce, maple syrup, and garlic in a bowl until smooth.
03 -
Place salmon fillet in prepared dish and sprinkle lightly with salt.
04 -
Brush marinade evenly over salmon to ensure full coverage.
05 -
Scatter tomatoes around the salmon and place lemon halves cut-side up in the dish.
06 -
Bake for 18–20 minutes until salmon flakes easily and tomatoes begin to burst.
07 -
Remove from oven and squeeze roasted lemons over salmon before serving.