Instructions
Place a large non-stick frying pan over low heat. Slowly cook the sliced onion in the olive oil and butter, stirring occasionally, until the onion becomes soft and translucent but not browned—this gentle process should take about 15 minutes, allowing the natural sweetness of the onion to develop. Add the peeled and sliced potatoes to the pan, cover with a lid, and cook for an additional 15 to 20 minutes. Stir occasionally to ensure the potatoes cook evenly and begin to soften without browning; the cover helps steam the potatoes to a tender texture. Once the potatoes are soft and the onions are glossy, crush two of the garlic cloves finely and stir them into the pan, followed immediately by pouring in the beaten eggs. The garlic adds a fragrant note that infuses the dish. Replace the lid and let the tortilla cook gently for about 20 minutes. During this time, the edges and base will develop a golden crust, while the top sets but remains slightly wobbly in the center—a sign the tortilla is ready to turn. To flip the tortilla, carefully slide it onto a large plate, place another plate over it, and invert the whole assembly. Then gently slide the tortilla back into the pan to cook the other side until it is fully set and lightly golden. Once cooked, transfer the tortilla onto a serving plate and scatter with the chopped parsley for a fresh, herbal finish. The tortilla can be enjoyed warm or cold, depending on preference. For a perfect accompaniment, warm the baguette slices, poke holes all over them with a fork, and rub each piece with the remaining garlic cloves. Top generously with grated ripe tomatoes, season with sea salt, and drizzle with olive oil to enhance the rustic flavors and add a refreshing contrast to the rich tortilla.