In a medium bowl, toss the oyster mushrooms with 1 tablespoon (15 ml / 0.5 fl oz) of the olive oil.
Season generously with salt and pepper to taste.
Add the panko bread crumbs and Old Bay seasoning to the bowl.
Toss gently until the mushrooms are evenly and thoroughly coated.
Heat the remaining 2 tablespoons (30 ml / 1 fl oz) of oil in a large skillet over medium heat.
Once shimmering, carefully add the coated mushrooms in a single layer.
Cook for 5-7 minutes, turning occasionally, until the mushrooms are golden brown and crispy on all sides.
Remove from the heat and set aside.
Split the sub rolls in half lengthwise.
Spread the cut sides of both halves with the soy mayonnaise.
To assemble, line the bottom half of each roll with the shredded lettuce.
Arrange the tomato slices on top, followed by the crispy oyster mushrooms.
Sprinkle with Tabasco to your desired level of heat.
Place the top half of the rolls on, press gently, and serve immediately with extra hot sauce on the side.
Don't overcrowd the pan when cooking the mushrooms.
Cook in batches if necessary to ensure they get perfectly crispy, not steamed.