Pat tuna steaks dry, season generously with salt/pep + fav spices; heat 1 tbsp oil in skillet over med/high + sear fish 2 min per side for med-rare (for well-done cook 1 min more per side)

Meanwhile, microwave sweet potato in wrapper on high, 6-8 min, flipping halfway through (caution, that's a hot potato!); carefully cut in half

Wash, then slice zucchini into ¼-inch rounds; heat 1 tbsp oil in skillet over med-high, add to pan, season with salt/pep + sauté 3-4 min until tender

Divide all to plates + drizzle vinaigrette over fish