Filtration is commonly defined as the mechanical or physical operation used to separate insoluble solid particles from solid-liquid mixture due to the difference in the size of solid-liquid particles.
So, the most appropriate method of removing tea leaves after preparing tea is by filtration.
A tea strainer can be used to fulfill the above separation process. The smaller size of holes of the tea strainer does not allow solid particles to pass through them, but the liquid passes through it.