Combine olive oil, fish sauce, pepper, salt, grated garlic, and ground sirloin; divide into 4 (3/4-inch-thick) patties. Heat a grill pan over high heat. Coat pan with cooking spray. Add patties and onion slices to pan; cook 3 minutes on each side or until desired degree of doneness. Spread 1 teaspoon canola mayonnaise on top and bottom of hamburger buns. Layer bottom half of each bun with 1 patty, 1 lettuce leaf, 2 thin tomato slices, one-fourth of onion, and top half of bun.
This is a good simple, unfussy burger, coming from someone who typically considers hamburgers boring. I used 85% lean ground beef, made the patties a bit smaller and left off the tomato and onion; but otherwise followed the recipe. Fish sauce is something I wouldn't have thought of to add, but it does impart an unexpected depth of flavor without tasting "Asian" or "fishy". It's a good basic burger recipe and I would make it again.
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