Add all ingredients except for jalapenos to a pan and bring to a boil.
While waiting for the liquid to heat, slice the jalapenos crosswise into thin slices. You can remove some seeds if you prefer less spice and heat.
Once the brine is boiling, add the jalapenos. Remove from heat and let cool for at least 8 minutes. You will notice the color turns into a lovely olive green. You can then start eating or add to other recipes.
Once the brine has cooled, remove the jalapenos from the pan with tongs and place into a glass jar. Pour the remaining brine over the jalapenos to fill the jar you are storing in.
You can use immediately, or store in the fridge for up to several months.