Honey Ginger Tea (Shōgayu)

Bahan-bahan (2 porsi)

• 1 Tbsp ginger ((grated, with juice; from a big knob 2 inches, 5 cm) )
• 2 cups water
• 2 Tbsp honey ((optional))
• 1 tsp freshly squeezed lemon juice ((optional))
• 1 Tbsp water
• ½ Tbsp potato starch or cornstarch