Savory Sweet Potato and Caramelized Onion Galette with Sage

Sweet potatoes, onions cooked down slow, and fried sage on a free-form crust. A savory galette that turns three cheap market vegetables into dinner for six.

By Amy Larsen1 min read

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Savory Sweet Potato and Caramelized Onion Galette with Sage
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There is a stretch of the market in October where the tables go quietly orange. Sweet potatoes in crates, onions by the sackful, squash stacked like firewood. All of it cheap, all of it keeps, and none of it feels like dinner on its own.

This is what I make with it. A galette is a tart for people who do not want to make a tart — no pan, no blind baking, no neat edges. You roll the dough into something roughly round, pile the filling in the middle, fold the sides up, and the mistakes read as rustic. It is the most forgiving thing in the pastry family, and it comes out of the oven looking like you tried much harder than you did.

Why these three vegetables, and why now

Sweet potatoes hit their best right after the first cool nights, when the starches have had time to turn sweet. Look for firm ones with tight skin and no soft spots, and ask your grower what variety they are — the pale-fleshed ones are drier and nuttier, the deep orange ones sweeter and more moist. Either works here. The deep orange ones look more dramatic sliced.

Onions at this point in the season are cured for storage, which is exactly what you want. A fresh summer onion has too much water in it to caramelize well. A properly cured storage onion cooks down into something jammy and almost sweet, and that is the backbone of this whole thing.

And sage — the herb that survives everything and is still going strong in most gardens in October, when the basil gave up weeks ago. If your market has a herb vendor, a bunch costs about a dollar and you will use every leaf.

The one step that matters more than the others

The onions. Give them the full forty minutes.

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I know how that sounds when the rest of the recipe is quick. But caramelizing is not the same as browning, and the difference is entirely time over low heat. Hot and fast gives you onions that are scorched at the edges and sharp in the middle. Low and slow gives you something closer to jam — soft, deeply savory, sweet without any sugar added. That is the flavor holding up the whole galette, and there is no shortcut that gets you there.

Put the pan on, set a timer, and go do something else in the kitchen. Stir every few minutes. If they start sticking, a splash of water and a scrape of the pan fixes it. You will know they are done when they have gone from white to gold to genuinely brown and the whole house smells like the good part of a restaurant.

The other technique note: slice the sweet potatoes thin. An eighth of an inch. Thicker than that and they will not cook through before the crust is too dark, which is the one way this goes wrong. A mandoline makes it trivial; a sharp knife and five minutes of patience makes it fine.

Make it yours

Swap the vegetable. Delicata squash needs no peeling and slices into pretty scalloped rounds. Butternut works. Thin-sliced potato and a lot more cheese is a different and excellent dish.

Change the cheese. Goat cheese gives you tang against the sweet onions. Ricotta is gentler and better for a table with children at it. A sharp cheddar grated over the sweet potato before baking makes it considerably more substantial.

Add something salty. Crisped bacon or pancetta scattered over the onions, or a few olives. If your market has a maker doing cured meats, this is where to use them.

Make it in pieces. Dough two days ahead, onions the day before. Then it is a twenty-minute job on the night, which makes it realistic for a weeknight instead of a project.

Serve it warm with a sharp green salad — something with mustard in the dressing, to cut all that sweetness. It is also very good at room temperature the next day, standing at the counter, which is how at least half of mine gets eaten.

If you make it, tag @butterandsagemarket — I want to see the fold. And if the sweet potatoes and the onions and the sage all came from the same market morning, tell us who grew them. Those are the people worth naming.

Savory Sweet Potato and Caramelized Onion Galette with Sage

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A free-form savory tart layering slow-caramelized onions, thin-sliced sweet potato and crisp sage on a buttery crust. Forgiving to make and generous to look at.

Savory Sweet Potato and Caramelized Onion Galette with Sage
Prep 30 min
Cook 1 hr 35 min
Rest 1 hr
Total 3 hr 5 min
Yield 6 servings
Level Medium
6

Ingredients

For the crust

For the filling

Instructions

Make the dough

  1. Whisk the flour, Parmesan and fine salt together. Add the cold butter and cut it in with your fingers or a pastry blender until the largest pieces are about the size of a pea. Leave them uneven — those butter pieces are what make the crust flaky.
  2. Add the ice water a tablespoon at a time, tossing with a fork, until the dough holds together when you squeeze a handful. It should look shaggy, not smooth. Pat into a disc, wrap, and chill at least 1 hour or up to 2 days.

Caramelize the onions

  1. Warm the olive oil and butter in a wide skillet over medium-low heat. Add the onions and 1/2 tsp of the kosher salt. Cook, stirring every few minutes, for 35 to 40 minutes, until deeply golden and jammy. If they start to catch, add a splash of water and scrape the pan. This step cannot be rushed and is most of the flavor.
  2. In the last 2 minutes, add 6 of the sage leaves and let them crisp in the fat. Set the onions aside to cool slightly.

Assemble and bake

  1. Heat the oven to 400°F with a rack in the lower third. Slice the sweet potatoes into rounds about 1/8 inch thick — a mandoline is easiest, a sharp knife and patience is fine.
  2. Roll the chilled dough on a floured sheet of parchment into a rough 13-inch round. It does not need to be a circle. Slide the parchment onto a baking sheet.
  3. Spread the goat cheese over the dough, leaving a 2-inch border. Spoon the onions over the cheese. Shingle the sweet potato rounds on top in overlapping circles, then season with the remaining 1/2 tsp salt and plenty of black pepper.
  4. Fold the border up and over the filling, pleating as you go. Brush the pastry with the beaten egg and tuck the remaining 4 sage leaves onto the top.
  5. Bake 45 to 55 minutes, until the crust is deep golden and a knife slides easily through the sweet potato. Rest 15 minutes before cutting — it slices cleanly warm, not hot. Finish with flaky salt.

Notes

Swap the sweet potato for delicata or butternut, sliced just as thin. Ricotta is milder than goat cheese if you are feeding children. The dough can be made up to two days ahead, and the onions a day ahead — the galette then comes together in about twenty minutes. Leftovers reheat well in a 350°F oven for 10 minutes; the microwave makes the crust sad.
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