In a saucepan place quaretered tomatoes, garlic, sliced shallot, thyme and lemon zest. Add olive oil until the tomatoes are just submerged. Let simmer on low heat for 45 minutes until tomatoes are warm and tender.
Once the tomatoes are cooked, strain oil and reserve for later. In a blender blend the tomato mixture until smooth. Keep in a warm place.
In a pot cover 2 cups beluga lentils with 4 cups of salted water (should taste slightly salty). Place over medium heat and simmer until tender. Once tender, strain lentils and add 1 oz butter. Keep in a warm place.
Toss baby carrots and Brussels sprouts in olive oil, salt and pepper. Place on a non-stick pan to roast in the over for 15 minutes at 350 F or until tender.
To finish: Ladle 1 oz of the tomato emulsion on the plate. In the centre of the plate place lentils and roasted vegetables. Set the Arctic char skin-side up on top of the lentils and vegetables.