Ginger Pork (Shogayaki)

Ingredients

For 2 servings

• 2 Tbsp soy sauce
• 2 Tbsp mirin
• 2 Tbsp sake
• 1 tsp sugar
• 1 Tbsp ginger juice
• 2-3 tsp ginger ((grated; leftover from juicing the ginger; optional, to taste))
• ½ yellow onion ((grate 1 Tbsp with juice for ginger sauce; use the rest to slice and stir-fry later))
• ¾ lb thinly sliced pork loin
• 1 Tbsp sake
• 1 Tbsp all-purpose flour (plain flour)
• 1-2 Tbsp neutral oil
• freshly ground black pepper ((optional))