Pan Pudding (Puding Roti Susu Jepang)

Bahan-bahan (2 porsi)

• ½ Tbsp unsalted butter ((for greasing the baking dish or dishes))
• 1 slice shokupan (Japanese milk bread)
• 2 large eggs (50 g w/o shell)
• ¼ cup sugar
• ⅛ tsp Diamond Crystal kosher salt
• ½ tsp pure vanilla extract
• 1½ cups whole milk ((you can use reduced-fat or non-dairy milk; however, the taste will be different))
• 2 Tbsp sugar ((use only granulated sugar))
• 1 Tbsp water ((at room temperature))
• 1 Tbsp hot water