Tortilla española — the thick Spanish potato omelette — is the most controversial preparation in Spanish cooking: the divide between tortilla jugosa (runny centre) and tortilla cuajada (fully set) is genuine cultural fault line. The jugosa version requires a specific technique of under-setting the egg and serving immediately; the cuajada version, while more stable, loses the characteristic silky interior that defines the finest tortillas.
- **The potato:** Peeled, sliced thin (3–4mm), slowly cooked in abundant olive oil — confited rather than fried. The potatoes must be completely tender without browning. [VERIFY] Koehler's potato technique. - **The onion (optional but traditional):** Added with the potato, slow-cooked to sweetness. - **The egg ratio:** 4–6 eggs per 500g potato. The egg is the binding medium; the potato is the bulk. - **The first cook:** The egg-potato mixture poured into a hot oil-filmed pan and cooked on the first side until the edges are set but the centre is still liquid. This requires medium heat, not high. - **The flip:** The defining technique — a plate larger than the pan placed over it, the pan inverted, then the tortilla slid back into the pan for the second side. This requires confidence. The soft, barely-set tortilla is the most challenging to flip cleanly. - **The jugosa target:** The tortilla is slid from the pan immediately when the second side is barely set — the interior remains custardy. If cut immediately, the runny centre is revealed. Decisive moment: The flip. The tortilla must be structurally set enough at the edges to survive the inversion but not so set that it becomes dry during the second-side cook. The correct state: the edges are firm, the surface is mostly set, and the centre visibly jiggles when the pan is shaken.
Spain: The Cookbook