Use ceremonial-grade matcha for drinking - culinary-grade is too bitter. Level your teaspoon; a heaping one tips into bitterness. Whisked matcha oxidizes after about 15 minutes, so whisk fresh each time. The honey-vanilla milk keeps in a sealed jar in the fridge for up to 5 days. For a vegan version, swap honey for maple syrup. For a hot version, warm the honey-vanilla milk and pour the whisked matcha over it.