Dainty Sichuan’s ma po doufu

Name: Dainty Sichuan’s ma po doufu
Prep time: 25 min
Cook time: 15 min
Total time: 40 min
Cuisine: Chinese
Ingredients: 600 gm tofu, cut into 3cm cubes; 150 ml chicken stock; 1 tbsp Shaoxing wine (see note); 2 tsp soy sauce; 3½ tbsp hot chilli broad bean paste (see note); 2 tsp fermented soy beans (see note), finely chopped; Pinch of chilli powder, or to taste; 1 tsp cornflour; 60 ml vegetable oil (¼ cup); 150 gm minced beef; 2 tsp Sichuan peppercorns, plus extra (optional), dry-roasted until fragrant (20-30 seconds), crushed in a mortar and pestle, to serve; 3 garlic cloves, finely chopped; 10 gm ginger, finely chopped (2cm piece); 1 tsp caster sugar; ½ bunch garlic chives, cut into 3cm batons; To serve: steamed rice