Heat oven to 425°F. Place all ingredients in a shallow 2-quart baking dish just large enough to hold potatoes in a single layer. Toss all ingredients together to coat potatoes, then arrange them in a single layer.
Bake until potatoes are well browned and crispy on all sides, about an hour to an hour and a half. Turn potatoes every 20 minutes or so. Test the potatoes with a knife to make sure they're cooked all the way through. It should go through easily.
Notes
Don't skimp on the salt. A teaspoon sounds like a lot, but the water dilutes it across the dish and the potatoes need it to taste like anything. If you're using fine salt instead of kosher, cut it to ¾ teaspoon.
Fresh oregano: Sub 2 tablespoons fresh chopped oregano for the 2 teaspoons dried. Add half at the start, half in the last 10 minutes so the fresh flavor stays bright.
What to serve with them: These are dairy-free and gluten-free, which makes them a quiet workhorse for a lot of dinners. Some favorites: Anything Greek: lamb chops, chicken souvlaki, a big Greek salad, Roast chicken, or salmon.
Why is there water in the recipe? That's the Greek braise-roast technique. The water reduces with the lemon and oil to form a concentrated dressing that the potatoes drink up while cooking. Don't skip it.