Drain excess water from the silken tofu package and transfer to a heat-proof plate. Let it sit for a few minutes to firm up slightly.

Slice the tofu into ½ to 1-inch pieces and arrange on the plate.

In a mixing bowl, combine minced garlic, soy sauce, black vinegar, sesame oil, vegetarian oyster sauce, sugar, and optional chili oil. Whisk until well blended.

Set up your steamer with water and bring it to a boil. If no steamer is available, place a heat-proof plate above boiling water.

Place the plate with sliced tofu into the steamer and cover. Steam for 8-10 minutes until heated and slightly puffed.

Carefully remove the plate and drain excess liquid. Pour the sauce generously over the steamed tofu.

Garnish with chopped spring onions and coriander. Serve warm with rice or congee.