Wash, dry and chop the rhubarb into pieces ½-1/4'' inch in thickness. Transfer to a glass jar with an airtight lid.
In a pot, add the vinegar, whole spices and garlic along with the salt and sugar and bring it to a boil.
Once the mixture comes to a boil, take it off heat and pour it into the jar with rhubarb.
Let it cool down completely, then close the lid and refrigerate.
Notes
If you don't have enough liquid to cover all of the rhubarb pieces, dilute the brine with some water, bring it up to a boil again and then pour it over the rhubarb.
Stick to a 1:2 ratio of salt to sugar for the pickling liquid.
Allow the pickled rhubarb to sit in the refrigerator for at least 2-3 days before you use it. This allows the rhubarb to soften just a bit, and for the flavors to develop and deepen even more.
When picking rhubarb for this recipe, make sure you choose ones that are soft and tender, and ideally have that bright red color.