food matters / 31
Classic Spanish Tortilla
Adapted from The Basque Book (Raij, Montero & Marx)
Serves 4–6  •  Prep: 20 min  •  Cook: 40–50 min  •  Rest: 1 hour
Ingredients
4–5 medium russet potatoes, (about 4 cups sliced)
1 medium Spanish onion, thinly sliced
1 cup canola oil
½ cup extra virgin olive oil (plus more as needed to cover)
8 large eggs
1 teaspoon Kosher salt or flaked sea salt
Directions
1.	 Peel 4 potatoes, rinse under cool water and cut lengthwise into quar­
ters. Slice quarters crosswise into ⅛-inch-thick pieces. You should 
have 4 cups of potato slices. If short, slice the fifth potato.
2.	 In a large 9- to 10-inch skillet, combine potato slices, sliced onion 
and a sprinkle of salt. Add canola oil and olive oil, enough to cover 
vegetables, adding more oil if needed. Cook over low heat uncovered 
for 30 to 40 minutes, until vegetables are completely tender but not 
browned.
3.	 Remove from heat and drain vegetables through a colander set over a 
bowl, reserving the oil for future use. Set the strained vegetables aside.
4.	 In a large bowl, beat eggs well with 1 teaspoon salt. Fold the drained 
potato-and-onion mixture into the eggs until fully combined.
5.	 Reheat the skillet over high heat, adding 2–3 tablespoons of reserved 
oil. When oil is just beginning to smoke, swirl it up the sides of the 
pan to coat well.
6.	 Pour the egg-and-potato mixture into the skillet. Using a spatula, stir 
mixture vigorously, about three times, then let it settle. The goal is to 
heat the interior without fully setting it. Use the spatula around the 
edges to shape the tortilla and prevent sticking.
7.	 When the eggs just begin to set at the edges (about 1 minute), reduce 
heat to medium-low and cook for 1 more min­
ute. The surface should still look slightly wet.
8.	 Invert a large flat plate over the pan. In one mo­
tion, flip the tortilla onto the plate. Slide the 
tortilla back into the pan, uncooked side down. 
Use the spatula to tuck and shape edges.
9.	 Continue cooking over medium-low heat for 
1 to 2 minutes more, until the tortilla is just 
set to your preferred doneness, custardy inside 
or cooked through.
10.	Slide onto a serving plate. Allow the tortilla to rest at room tempera­
ture for at least 1 hour before slicing. Cut into wedges or bite-sized 
squares.
Variations
•	
Fold any additions into the egg 
mixture along with the cooked po­
tatoes and onion such as: fresh peas, 
sautéed sliced asparagus, zucchini 
or wild mushrooms, roasted cherry 
tomatoes, caramelized leeks or a 
scattering of crispy chorizo or bacon.
•	
Serve the tortilla with a sauce, typi­
cally a warm sweet pepper sauce (salsa de pimientos) or romesco.
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Fournier flips the 
tortilla onto a plate 
before sliding it back 
into the pan.
After sliding the tortilla into the 
pan, use a spatula to tuck and 
shape edges.

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