Matcha Marshmallows

Name: Matcha Marshmallows
Prep time: 40 min
Total time: 40 min
Cuisine: Asian, Japanese
Ingredients: 240 milliliters water (1 cup), divided; 20 grams powdered gelatin (2 tablespoons; 3 US packets); 400 grams granulated sugar (2 cups); 200 grams corn syrup (1/2 cup); 1/4 teaspoon fine sea salt; 6 grams matcha powder (1 tablespoon); Canola oil or nonstick cooking spray, for greasing tin and knife; 50 grams confectioner’s sugar (1/3 cup); 50 grams cornflour/cornstarch (1/3 cup); 4 grams matcha powder (2 teaspoons)