Preheat oven to 400°; slice ½ of potatoes into 1-inch pieces, mix with 1 tbsp oil, salt/pep + fave spices, then spread on a sheet pan cut-side down; roast 25-30 min until tender

Meanwhile, pat tuna steaks dry, season with salt/pep + fav spices; heat skillet over med-high with 1 tbsp oil; sear steaks 2 min per side for med-rare* (if width of steak is less than 1-inch reduce by 1 min on one side); slice into bite-size pieces

Add a handful of arugula to plates next to potatoes + place fish on top; drizzle on ¼ cup sauce—looks good!

*The USDA recommends a minimum safe cooking temperature of 145°F for tuna