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Make beet skin molasses: Boil beet skin and apple juice in a medium skillet over medium heat until it is syrupy and bubbling all over, about 5 minutes. Strain into a small bowl and set aside.
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Mix up the sumac salt: Mix the sea salt, sumac and sesame seed. Set aside.
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Cook salmon: Turn on the oven to 400°F. Coat the salmon all over with oil and sprinkle the meaty side with the sumac salt. Put an ovenproof skillet over medium-high heat and brown the salted side just until browned, about 2 minutes. Flip the salmon and roast in the oven until the flesh flakes to a gentle push, about 10 minutes per inch of thickness.
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Serve: Transfer salmon to a serving plate and drizzle with beet molasses. Scatter sliced scallion over top, if you want.
Insta-photo note: I used golden beet skin for the test (it was all they had at the market that day), but I recommend using red beet for the finished photo. It will look more dramatic.