* The tarragon sprigs should only remain in the vodka for a maximum of 2 days. If left longer, the tarragon flavor will overpower the grapefruit flavor. I tasted the vodka once before adding the sprigs and then each day after to make sure the flavor was good.
** You want to be certain that you strain out all of the solid materials from the vodka. Any leftover particles will breakdown over time and have an adverse effect on the taste. You should strain out the vodka with a fine-mesh basket strainer or a coffee filter (or both if you are worried!). Store in the refrigerator for up to 2 to 3 months.