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In a pan over medium-high heat. Add cooking oil, 1 inch deep. Once the oil is hot enough, add tofu cubes and fry until golden brown. You may need to turn the tofu to avoid from sticking to the pan.
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While frying the tofu, we can prepare our sauce/coating: In a small bowl, mix mayonnaise, liquid seasoning, oyster sauce, and calamansi juice. Do a taste test and add salt & pepper if you like. Adjust according to your taste. Cover and keep this in the fridge until ready to use.
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When the tofu is golden brown, remove from the pan and put on a strainer to drain excess oil. Remove the oil from the pan (reserve it to use later if you like).
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In the same pan over medium heat, add 1 tbsp of oil (from the same oil you used in frying tofu). Add chopped onion and cook for 1 minute. Now, add the red & green chilis; cook for few seconds.
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Add fried tofu and the sisig sauce. Mix everything and just let it cook for 1 minute.
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Turn off the heat and place the tofu sisig in a serving plate. Enjoy with white rice.