Sweet Potato Gratin with Caramelized Onions & Sage

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Recipe by Charlene Elderkin

Serves: ~8-8. Prep time: 20 minutes. Cook time: 55-80 minutes.
Adapted from: The Kitchn (http://s.coop/1v8b1)

Ingredients:

  • 2 Tbsp butter

  • 2 med. onions, peeled & sliced into thin ½ moons, cut ¼" thick

  • 3 lbs sweet potatoes (~3-4 large sw. potatoes)

  • Salt & pepper

  • 4 garlic cloves, minced

  • ¼ cp + 2 Tbsp fresh or 4 tsp + 2 tsp dried sage leaves, finely chopped

  • ¼ tsp chipotle powder (optional)

  • 1 cp heavy cream, milk or coconut milk

  • ½ cp Parmesan or mild cheddar cheese, grated

  • Olive oil or sunflower oil

Preparation:

  1. Preheat oven to 375°F.

  2. Heat butter in wide skillet over med-heat. Once heated, add onions. Sprinkle lightly with salt. Slowly caramelize onions until nicely browned all the way through, stirring frequently, ~15-30 mins.

  3. While onions caramelize, slice sweet potatoes into ¼" moons. In lightly oiled 9”x13” casserole dish, lay out one layer of potato rounds that slightly overlap. Sprinkle lightly with salt & pepper.

  4. When onions are caramelized, add garlic & cook until golden. Then add fresh or dried sage, chipotle powder & cream. Mix together well making sure to scrape all caramelized brown bits off bottom of pan. Remove from heat.

  5. Transfer onion & cream mixture in an even layer to casserole dish with sweet potatoes. Layer remaining potatoes on top of onion & cream layer, forming tight, slightly-overlapping rows. Sprinkle lightly with salt & pepper. It will look like there isn’t enough cream – but resist the impulse to add more. Cover casserole dish tightly with tinfoil. 

  6. In preheated oven, bake casserole for 25-30 mins. or until potatoes are just tender & cream is golden brown & bubbling. NOTE: baking time completely depends on how thick potatoes are cut. If potatoes are sliced thicker than ¼", increase baking time!

  7. Remove from oven & remove tinfoil. Sprinkle cheese & remaining sage over top of gratin & drizzle lightly with olive or sunflower oil. Return the uncovered dish to oven for ~15-20mins. or until brown & crispy. Remove from oven & let cool for a minimum of 15mins. before slicing & serving.

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