Roughly chop the mushrooms into very small pieces, around 1/2-inch (1.25-cm) pieces or smaller.
If using tofu skin or soy chunks/curls, soak these in water until completely rehydrated. Squeeze out the excess liquid and then chop these up into very small pieces, similar to the mushrooms.
Sauce
Mix all the sauce ingredients together. Feel free to adjust to your taste.
Cooking the Sisig
Heat your medium/large cast iron pan over high heat (mine was 10-inches). Once hot, lower the heat to medium then add the butter. Sauté the onion for 1 minute.
Add in the garlic, then sauté for another minute.
Add in the chiles and peppers and cook for 1-2 minutes until tender.
Add in the diced mushrooms and tofu skin/soy chunks then pour in the sauce. Turn up the heat to medium high and cook down the mushrooms for 4-5 minutes or until it releases its liquid and starts to dry up. This part can take a bit long, so patience is key!
Mushrooms release a lot of water but once they do, they’ll cook down in the sauce and absorb all the flavours!
Once the mushrooms have dried up, mix in the vegan mayo.
Taste the sisig then season with more vegetarian mushroom oyster sauce and/or liquid seasoning or soy sauce, if needed.
Mix everything together and leave to cook over medium heat for 1 minute until the mayo has coated the sisig very well.
To Serve
Turn off the heat and serve while hot with a squeeze of more calamansi/lemon juice. I love the citrusy flavour and tang of calamansi with sisig so I love squeezing a lot more juice on mine. But it's really a personal preference!
These add that 'meaty' bite to the sisig. If you're unable to find any tofu skin or soy chunks/curls, you can opt to just use 100 g more of fresh oyster mushrooms. So that will be a total of 450 g (1 lb) fresh mushrooms for this recipe.
Mushrooms
Feel free to use other fresh mushrooms of choice (like shiitake, king oyster, baby bella, button, etc)
Rehydrated mushrooms: you can also use dried shiitake mushrooms or other mushrooms and rehydrate this in hot water.
Here are some soy chunks/curls you can find on Amazon:
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