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Halve the king oyster mushrooms lengthwise and carefully score the cut sides in a criss-cross pattern without cutting all the way through. Brush with oil, evenly coat with the veggie rub, and preheat the grill or plancha to medium-high heat.
First, grill the mushrooms cut-side down for about 4-5 minutes, then turn them over and cook for another 4-6 minutes, until they are browned and tender.
Melt the butter and mix it with 1–2 tsp lemon juice and a little finely grated lemon zest. Pour the lemon butter over the hot mushrooms.
If you don't have a grill, the king oyster mushrooms can be seared in batches in a heavy pan over medium to high heat. Use unsalted butter and add the lemon butter at the very end so it doesn't burn.