Toss the beef with 1½ teaspoons fine sea salt and set aside.
If using, thinly sliced the scallions, reserving the darker green parts. Peel and coarsely chop the garlic.
In a blender or food processor, blitz the coconut milk, coconut aminos, dates, white and light green scallions slices or onion powder, chopped garlic or garlic powder, cumin, ground coriander and red pepper flakes. Taste and add salt if necessary.
If you have time to marinate (it's not necessary but adds a bit more depth of flavor), toss the beef with the sauce and marinate at room temperature for one hour. For any longer than that, store in the fridge for up to 24 hours.
For the sesame seeds: While your stew is cooking per one of the methods below, toast your sesame seeds, if using. Add the seeds to a small, dry, cold skillet. Place over medium heat and stir occasionally. Once you begin to smell them after about 5 minutes, you don't want to walk away or they'll burn evenly. Keep stirring until they're evenly toasted, then pour into a bowl.
For the stovetop: add the beef to a heavy Dutch oven or stock pot and pour the sauce over. Stir the beef to make sure it's evenly coated. Bring to a boil then reduce to a simmer for 2 hours. Cover if it looks like the sauce is reducing too much. Use a slotted spoon to remove the beef from the pot. Whisk in the sunbutter and lime juice. Taste and add more salt if necessary, then mix the beef back into the sauce. Serve warm, garnished with the toasted sesame seeds and dark scallion greens, with lime wedges on the side for spritzing.
For the crockpot: add the beef to the crockpot and pour the sauce over. Stir the beef to make sure it's evenly coated. Cook on low for 8 hours or high for 5 hours, or until the beef is tender. Use a slotted spoon to remove the beef from the pot. Whisk in the sunbutter and lime juice. Taste and add more salt if necessary, then mix the beef back into the sauce. Serve warm, garnished with the toasted sesame seeds and dark scallion greens, with lime wedges on the side for spritzing.
For the Instant Pot: add the beef to the insert and pour the sauce over. Stir the beef to make sure it's evenly coated and the sauce reaches the bottom of the pot. Cover, seal and cook for 20 minutes. Immediately release the pressure (or letting it naturally de-pressurize is fine, too). Use a slotted spoon to remove the beef from the pot. Whisk in the sunbutter and lime juice. Taste and add more salt if necessary, then mix the beef back into the sauce. Serve warm, garnished with the toasted sesame seeds and dark scallion greens, with lime wedges on the side for spritzing.