In a large skillet or Dutch oven, heat olive oil over medium-high heat. Add the ground beef, breaking it up with a wooden spoon. Season with garlic powder, onion powder, salt, and pepper. Cook for 5-7 minutes, stirring occasionally, until browned and no longer pink. Drain excess fat if needed, but leave a little for flavor—pro tip: A cast-iron skillet distributes heat evenly for perfect browning without sticking.
Push the beef to one side of the pan. Add diced onion to the empty side and sauté for 3-4 minutes until softened—use a sharp chef's knife for quick, even dice to release those natural sugars. Stir in garlic and orzo, toasting everything together for 1-2 minutes until the orzo is lightly golden and fragrant, enhancing its nutty notes for better digestion.
Pour in the broth, lemon zest, and half the lemon juice. Stir to combine, scraping up any browned bits from the pan (that's flavor gold packed with umami!). Bring to a boil, then reduce to a low simmer. Cover and cook for 10-12 minutes, stirring halfway, until orzo is tender and liquid is mostly absorbed. If it thickens too much, splash in a bit more broth—health boost: Lemon adds vitamin C to support immune health.
Remove from heat, stir in the remaining lemon juice, chopped herbs, and nuts if using. Let it sit covered for 2 minutes to fluff up. Spoon into bowls and add your optional toppings for extra burger flair—tool tip: A microplane zester makes quick work of that lemon for bright, even infusion.