Sansai (Mountain Vegetable) Tempura with Matcha Salt

Ingredients (8)

• 1 tablespoon sea salt
• 1 teaspoon matcha powder
• 1 1/2 cups rice flour, divided
• 1 cup and 3 tablespoons ice-cold water
• 1/4 teaspoon salt
• 1 large egg
• Sansai vegetables
• Canola oil, for frying