You want to grill the salmon by heating coal at medium-high heat. Make sure to brush the grill grate with oil. Marinate the salmon with olive-extracted oil, salt, brown sugar, and pepper, depending on your taste.
Grill the salmon on each side for 5 minutes. Take grilled salmon out and let it rest on the plate for 3-5 minutes.
Make the sandwich sauce by mixing sour cream, mayonnaise, vinegar, basil, scallions, dill, pepper, and salt. Then use the food processor to blend all the ingredients well.
Spread every tablespoon of sauce on each side of the bun. Lay some mesclun on the other side of a cut side, then place the salmon. It's time to enjoy it.