Preheat grill to high + oil grates; cut potatoes into eighths, then toss with 1 tbsp oil, ranch seasoning + salt/pep; add potatoes to piece of foil + wrap tightly; grill in foil 28-30 min with lid closed until tender, flipping over halfway through

Toss asparagus in 1 tbsp oil + salt/pep; grill 2 min with lid closed, flip over + grill 2-3 min more until charred + slightly softened

Rub 2 tuna steaks with 1 tbsp oil + salt/pep; grill 3 min with lid closed, flip, brush with 2 tbsp sauce + grill 3 min more

Divide ingredients between plates + drizzle 2 tbsp sauce onto tuna—looks good!