Prep the vegetables: wash the potatoes and cut into 1–1.5 cm (3/4 inch) dice for fast, even cooking; peel and finely dice the onion; core and cut the bell pepper into 1 cm pieces; score the tomato skin with an X and plunge into boiling water for 20–30 seconds then shock in ice water, peel and dice. Doing uniform dice ensures even cooking so potatoes will crisp at the same time the ragù softens.

Parboil the potatoes: place the diced potatoes in salted cold water, bring to a simmer and cook for 6–8 minutes until just tender when pierced (not falling apart). Drain thoroughly and let steam-dry in the colander for 3 minutes. Parboiling shortens pan time and yields tender interiors without over-browning externally.

Heat 2 tablespoons of the olive oil in a large heavy skillet (cast-iron preferred) over medium-high heat until shimmering. Add the potatoes in a single layer and let them sear without moving for 4–5 minutes to build a brown crust — this Maillard browning is key for restaurant-quality texture. Toss and continue to cook, turning occasionally, until most sides are golden (another 4–6 minutes). Transfer potatoes to a bowl and keep warm.

Lower the heat to medium and add the remaining 1 tablespoon oil to the same skillet. Add the diced onion and a pinch of salt and cook, stirring occasionally, for 6–8 minutes until the onion is soft and starting to caramelize. Slowly cooking the onion develops natural sweetness and creates depth in the sauce.

Add the bell pepper and continue to sauté for 4–5 minutes until the pepper softens and its edges begin to blister. Tasting at this stage gives a sweet-roasted flavor; letting it color slightly adds complexity.

Smash or finely mince the garlic and add to the pan; cook for 30–45 seconds until fragrant but not brown (garlic burns quickly and turns bitter). Immediately stir in the smoked paprika, which you should briefly toast in the oil for 15 seconds to bloom its smoky aroma.

Add the diced tomatoes and 60 ml (1/4 cup) water or stock, scrape up any brown bits from the pan with your spoon (those are flavor). Bring to a gentle simmer and cook uncovered for 8–10 minutes until the tomatoes break down into a chunky sauce. Cooking the tomato mixture concentrates flavor and melds the aromatics into a silky ragù.

Return the seared potatoes to the pan, gently folding them into the tomato-pepper ragù so they are coated but not smashed. Taste and adjust seasoning with more salt and black pepper. Combining at the end preserves the potatoes' crisp edges while allowing them to absorb some sauce.

Let everything cook together for 2–3 minutes more so flavors marry, then remove from heat. Sprinkle with chopped parsley or basil to lift the dish with freshness. Resting briefly concentrates flavors and prevents the potatoes from becoming soggy.

Serve warm as a rustic main with crusty bread and a green salad, or as a side to grilled fish or chicken. The contrast of textures (crispy potato edges and silky confit) and bright tomato-acid balance is what gives this dish its restaurant-quality appeal.