Wash and dry the vegetables, making sure all the moisture has been dried off.
Julienne the carrots and jalapeno.
Toss everything together and add to a clean and dry 16 ounce mason jar or any large jar.
Crush the mustard seeds in a coffee grinder or a mortar and pestle and add to the jar with the vegetables.
Lastly stir together the vinegar, water and the seasonings till dissolved. Add this mixture to the jar and press down on the veggies so that everything is submerged in the liquid.
Refrigerate and use as needed. The vegetables will continue to marinate in the liquid and ferment. For best results, wait 24 hours before consuming.