Best Way to Thaw Frozen Spinach 

The best way and fastest way to thaw frozen spinach is to put it in a mesh strainer and run it under very warm water. Feel around for icy chucks of spinach and break them apart with your fingers. Turn off water, grab a handful of spinach and SQUEEZE the water out back over the strainer.

Depending on the recipe, it’s not absolutely necessary to make the spinach feel bone dry, unless you were using it to fill pastry or adding it to a creamy pasta dish.