Measure and prep. Pat the sea bream fillets dry with paper towel (dry skin crisps better). Grate the ginger, thinly slice the spring onion, trim asparagus to even lengths, and zest a bit of the lemon if you like extra aroma. Having everything measured keeps cooking tight and prevents overcooking delicate fish.

Rinse the rice under cold water until the rinse runs almost clear—this removes excess surface starch so the cooked short-grain brown rice stays distinct rather than gluey. Drain and (optional but recommended) soak the rice in the 300 ml cold water for 20–30 minutes; soaking shortens the simmer time and helps the grains cook evenly.

Cook the rice: transfer soaked rice plus its soaking water (use 300 ml total) to a small heavy-bottomed pot with a tight lid. Add a pinch of salt. Bring to a gentle boil uncovered, stir once, then reduce heat to very low, cover, and simmer for 30–35 minutes until water is absorbed and grains are tender. Why: low steady heat and a tight lid let the grain steam through without burning; avoid lifting the lid often because you lose steam and increase cooking time.

Make the ginger‑soy glaze: in a small bowl whisk together grated ginger (4 g), light soy sauce (30 ml), sesame oil (5 ml), honey or mirin (5 ml), and half the rice vinegar (2.5 ml). Reserve 1 tablespoon of this glaze aside for finishing the plated fish. The rest will be used to marinate and roast. Reason: combining ingredients ahead lets flavors marry and the honey help the glaze caramelize in the oven.

Marinate the fish briefly: place fillets skin-side up (or presentation-side up) on a plate and brush both sides lightly with half of the glaze; season the flesh with a very light sprinkle of salt and pepper. Let rest 8–10 minutes at room temperature — short marination infuses flavor without starting to 'cook' the fish in the soy. Avoid long marination in salty soy which can draw moisture out.

Preheat oven to 220°C / 425°F (convection if available). If the fillets have skin and you want it crisp, score the skin lightly with 1–2 shallow diagonal cuts (careful not to cut through). Place the fillets skin-side down on a parchment-lined baking sheet or an oiled rimmed tray. Why high heat: a hot oven quickly caramelizes the glaze and seals the exterior so the fish stays juicy inside.

Roast the fish: place the tray in the preheated oven and roast for 8–12 minutes (depending on thickness) until the flesh is opaque and just flakes with a fork. For 180 g fillets expect ≈9–10 minutes. Spoon the reserved glaze over the fillets in the last 60–90 seconds and return to the oven to set the glaze — this gives a glossy finish without burning the sugars. Rest the fillets 1–2 minutes after roasting so juices redistribute.

Steam the asparagus: while the fish roasts, steam the asparagus for 3–4 minutes (or blanch in salted boiling water for 2 minutes then shock in ice water) until bright green and just tender-crisp. Why: quick steaming preserves sweetness, color, and bite — overcooked asparagus becomes limp and dull.

Finish the rice: when rice is cooked, remove it from heat and let it sit covered 5 minutes. Fluff with a fork and immediately stir in the remaining 2.5 ml rice vinegar, 1/2 teaspoon sesame oil (optional, using a little from your pantry), and half the toasted sesame seeds. The vinegar brightens the rice; stirring while warm lets those aromatics distribute evenly.

Plate: spoon a mound of sesame brown rice onto each plate. Arrange steamed asparagus alongside. Place a roasted sea bream fillet on the rice (or to the side), spoon any pan juices and the reserved glossy glaze over the fish, then sprinkle with sliced spring onion, the remaining toasted sesame seeds, chopped cilantro and a lemon wedge. A squeeze of lemon just before eating lifts the soy-ginger notes.

Final seasoning and serve: taste one asparagus spear and a bit of rice; add flaky sea salt or a quick grind of black pepper if needed. Serve immediately while the fish is hot and rice is warm — the contrast of warm glazed fish and bright herbs is what makes the dish sing.