Trim and cube: If your beef isn't already cubed, trim any large pieces of fat and cut into ~1 to 1¼-inch cubes so they cook evenly. Uniform pieces ensure even cooking and predictable doneness.

Make the marinade: In a bowl combine 3 tbsp olive oil, minced garlic, smoked paprika, dried oregano, zest and juice of half the lemon, 1 tsp kosher salt and a generous grind of black pepper. Whisk to emulsify—the oil carries the aroma of the spices and lemon into the meat and helps char during grilling.

Marinate the beef: Toss the beef cubes in the marinade, cover and refrigerate 30 minutes (up to 2 hours). Marinating briefly seasons and tenderizes; avoid over-marinating with citrus for more than 2 hours on lean beef to prevent mushy texture from acid.

Prep the vegetables: While the beef marinates, cut bell peppers into 1½-inch squares, core and halve the red onion into wedges about 1-inch thick, and slice zucchini into ½-inch thick rounds. Keep vegetable pieces similar in size to the beef so they cook at the same rate.

Skewer strategy: If using wooden skewers, soak them in water for 30 minutes to prevent burning. When threading, alternate beef with pepper, onion and zucchini, leaving a little space between pieces so hot air and heat can circulate—crowded skewers steam instead of char.

Preheat grill or pan: Heat a gas or charcoal grill to medium-high (about 425–475°F / 220–245°C). If using a heavy skillet or grill pan, heat it over medium-high until smoking slightly. High direct heat quickly sears the exterior, creating the Maillard crust that gives depth of flavor.

Cook the kebabs: Brush the skewers lightly with the remaining 1 tbsp olive oil and season with a pinch more salt. Grill or pan-sear the kebabs 3–4 minutes per side, rotating to get even char and internal color to medium-rare/medium depending on preference (use a thermometer: 130–135°F for medium-rare, 140–145°F for medium). Sear time locks juices inside and develops complex flavors from caramelization.

Rest the meat: Transfer kebabs to a plate, tent loosely with foil and rest 5 minutes. Resting allows juices to redistribute so they don’t run out when you bite into the meat.

Make the couscous: While kebabs cook, bring 2½ cups (600 ml) water or stock to a boil with ½ tsp salt and 1 tbsp olive oil in a saucepan. Stir in the whole-wheat couscous, cover immediately, remove from heat and let sit undisturbed 8–10 minutes until the liquid is absorbed. Covering lets the grains steam gently and finish cooking without becoming gummy.

Finish the couscous: Fluff the couscous with a fork to separate the grains. Fold in the remaining lemon juice (from half the lemon), a drizzle of olive oil (if desired), a pinch of salt and 1 tbsp chopped fresh parsley or mint if you have it. Forking breaks up lumps and keeps the texture light and fluffy.

Plate and garnish: Pile a generous scoop (about 1 cup) of couscous onto each plate, slide 2 skewers of beef and vegetables on top, and spoon any resting juices from the kebabs over the couscous for extra flavor. Finish with a light squeeze of lemon and an optional sprinkle of flaky sea salt.

Serving note: Offer sauces on the side like tzatziki, garlic yogurt, or a simple herb vinaigrette—acidity and creaminess add contrast and make the dish feel restaurant-level.