Coarsely grate zucchini, then toss with 2 teaspoons salt and let stand 30 minutes.
While zucchini stands, peel potatoes and cut into 1/3-inch dice.
Heat oil in skillet over medium-high heat until hot, then add potatoes, onion, and 3/4 teaspoon salt. Reduce heat to medium-low and cook (without browning), uncovered, stirring occasionally, 30 minutes.
Transfer zucchini to a colander to drain, then squeeze small handfuls to remove as much liquid as possible, transferring as squeezed to a small bowl.
Add zucchini to potatoes and cook, stirring occasionally, until potatoes are tender and zucchini is slightly browned, about 15 minutes. Drain vegetables in colander set over a bowl, reserving oil. Cool 5 minutes.
Lightly beat eggs in a large bowl, then stir in vegetables, 1 tablespoon reserved oil, 3/4 teaspoon salt, and 1/2 teaspoon pepper.
Return 1 tablespoon reserved oil to skillet and add egg mixture, pressing potatoes flush with eggs. Cook over low heat, covered, until almost set and underside is golden, 12 to 15 minutes. Remove from heat and let stand, covered, 15 minutes.
Run a rubber spatula around tortilla and shake skillet gently to loosen (if bottom sticks, carefully slide spatula underneath). Slide tortilla onto a large flat plate, then cover with skillet and invert tortilla back into skillet. Round edge of tortilla with rubber spatula and cook over low heat, uncovered, until set, about 15 minutes more.
Slide tortilla onto a serving plate and cut into wedges. Serve warm or at room temperature.
Cooks' note: Tortilla can be made 1 day ahead and chilled.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	389.28 Kcal (1630 kJ)
Calories from fat	289.29 Kcal
		% Daily Value*
Total Fat	32.14g	49%
Cholesterol	155mg	52%
Sodium	85.24mg	4%
Potassium	627.78mg	13%
Total Carbs	17.42g	6%
Sugars	5.67g	23%
Dietary Fiber	3.02g	12%
Protein	9.2g	18%
Vitamin C	35.5mg	59%
Vitamin A	0.8mg	25%
Iron	2.3mg	13%
Calcium	59.6mg	6%

Amount Per 100 g
Calories	150.53 Kcal (630 kJ)
Calories from fat	111.87 Kcal
		% Daily Value*
Total Fat	12.43g	49%
Cholesterol	59.94mg	52%
Sodium	32.96mg	4%
Potassium	242.76mg	13%
Total Carbs	6.74g	6%
Sugars	2.19g	23%
Dietary Fiber	1.17g	12%
Protein	3.56g	18%
Vitamin C	13.7mg	59%
Vitamin A	0.3mg	25%
Iron	0.9mg	13%
Calcium	23.1mg	6%

* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.

Tastes

salty
savory
bitter
sweet

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