In a roasting pan toss new potatoes with 1 1/2 tablespoons of the garlic olive oil.
Place in oven and bake 15 minutes.
Meanwhile, toss asparagus with remaining garlic olive oil and spread pesto over fish fillet with pesto.
Remove roasting pan from oven, add asparagus to roasting pan. Make a space in the center of the potatoes and asparagus and place fish fillet there. Put roasting pan back in the oven and bake 15 minutes.
Test fish to make sure it is cooked in the middle (trout cooks faster than salmon which cooks faster than cod), if not bake another 3 – 5 minutes or until done.