Preheat your oven to 425°F.
Toss broccoli florets with olive oil, salt, and pepper, and spread them out on a baking sheet.
Roast the broccoli in the preheated oven for about 15-20 minutes, until tender and slightly crispy on the edges.
Meanwhile, season the tuna steak with salt and pepper on both sides.
Heat a non-stick skillet over medium-high heat and add a small drizzle of olive oil.
Place the tuna steak in the skillet and sear for about 2-3 minutes per side for medium-rare, or adjust to your preferred doneness.
In the last minute of cooking, add minced garlic to the skillet to infuse the tuna with a garlic aroma.
Remove the tuna and let it rest briefly before slicing.
Plate the sliced tuna alongside the roasted broccoli, and drizzle any remaining garlic-infused oil over the top.
Serve immediately and enjoy your balanced, flavorful meal.