tsp.       
(also tsp, US also t.)
 一茶匙的量(teaspoonful的缩写)
written abbreviation for teaspoonful 
  Add one tsp. of ground coriander. 添加一茶匙磨碎的香菜。 
 Mix in 1 level tsp of baking powder and 1 level tsp of ground cinnamon.
 - More examples
 - Add 1–2 tsp. chilli powder.
 - Sprinkle 2 tsp. of brown sugar on top of each tart.
 - Use 1 tsp of wholegrain mustard.
 - Throw in about 2 tsp chopped thyme for some extra flavour.
 - Mix 1 tsp dried yeast with 500ml warm water in a large bowl.
 - Add 1 t. vanilla.