Prep the aromatics and basil: finely dice the onion and mince the garlic; chiffonade (thinly slice) 8 of the basil leaves and reserve a few whole leaves for garnish. Doing this first keeps you organized and allows flavors to be added at the right time — finely diced onion sweats and sweetens faster, and chiffonaded basil disperses flavor evenly through the sauce and meat.

Make the meatball mixture: in a large bowl combine the ground beef, almond flour, beaten egg, half the minced garlic (reserve the rest for the sauce), 1/2 tsp black pepper, 3/4 tsp salt, and 1 tsp dried oregano. Use your hands and gently fold — do not overwork the meat. Gently mixing prevents the meat from becoming dense; the almond flour and egg provide structure while keeping the texture tender (paleo-friendly binder).

Portion and shape the meatballs: wet your hands lightly with water to prevent sticking and form the mixture into 12 even meatballs (about 40–45 g / 1.5 oz each). Consistent size ensures even cooking and makes the presentation restaurant-worthy.

Sear the meatballs: heat 1 tbsp of olive oil in a large heavy skillet (preferably stainless steel or cast iron) over medium-high heat until shimmering. Add the meatballs in a single layer without crowding and brown on all sides, about 2–3 minutes per side. You're not cooking them through — you are developing a Maillard crust which gives deep, savory flavor to both meat and sauce. Work in batches if needed and transfer browned meatballs to a plate.

Build the sauce base: lower the heat to medium, add the remaining 1 tbsp olive oil to the skillet, and add the diced onion. Sweat the onion for 4–5 minutes until translucent but not browned — sweating gently releases the sweetness and body into the sauce. Add the remaining minced garlic and red pepper flakes (if using) and cook for 30–45 seconds until fragrant; garlic burns quickly, so short cooking preserves its brightness.

Deglaze and add tomatoes: pour in the crushed tomatoes and use a wooden spoon to scrape up the browned bits (fond) from the bottom of the pan — those are concentrated flavor. Add the chiffonaded basil and the remaining 1/4 tsp salt. Bring the sauce to a gentle simmer.

Simmer with meatballs: nestle the seared meatballs into the sauce, partially cover the skillet, and simmer gently for 12–15 minutes until the meatballs are cooked through (internal temperature 71°C / 160°F) and the sauce has thickened slightly. Simmering allows the meatballs to finish cooking while absorbing the tomato-basil flavors; covering helps keep them moist without boiling the sauce.

Prepare the zoodles while the sauce simmers: place the spiralized zucchini in a colander, sprinkle with 1/4 tsp salt, and toss lightly. Let them sit for 5–10 minutes — this draws out excess water and prevents a watery sauce. Pat dry with paper towels before cooking. Removing excess moisture keeps the zoodles crisp-tender and prevents diluting your sauce.

Finish the zoodles: when the meatballs are almost done, heat a separate large nonstick skillet over medium-high heat. Add a quick spray or 1/2 tsp of olive oil and add the zoodles in a single layer, tossing gently for 1–2 minutes until just warmed and al dente. Quick cooking preserves zucchini's texture — overcooking makes them mushy. Season with a pinch of salt and a few cracks of black pepper.

Plate and finish: mound zoodles on warmed plates, place 3 meatballs per serving atop the zoodles and spoon a generous ladle of tomato-basil sauce over everything. Finish with torn basil leaves, chopped parsley, and a drizzle of extra-virgin olive oil if desired. A final fresh basil garnish brightens the dish and adds a fragrant, herbaceous finish.

Taste and adjust: always taste the sauce for salt, pepper, and acidity — if the sauce tastes too acidic, stir in a pinch of baking soda (¼ tsp) or a tiny drizzle of honey/maple syrup (not strictly paleo for some) to round it out. Adjust seasoning before serving for best results.