1-First Step: Get the vegetables ready Start by slicing the jalapeños, mincing the garlic, and slicing the onion. If you want a milder Sweet & Spicy Pickle Slaw, remove the jalapeño seeds before slicing. Then pour the tri-color coleslaw into a large bowl and toss it with the jalapeños, garlic, and onion so the mix is evenly combined. This first toss matters more than you might think. When everything is mixed before it goes into the jars, you get a better balance of flavor in every bite. If you are making this for a family meal or a party tray, an even mix also makes the slaw look more colorful and inviting.

2-Second Step: Pack the jars Divide the vegetables between two pint-sized mason jars or one quart-sized mason jar. Place the jars near the stove with a kitchen towel underneath. That towel is a simple safety step in case any hot brine drips as you pour it in. Use only heat-proof jars for this part. Regular glass can crack when hot liquid hits it, and nobody wants that mess. If you are making a larger batch for meal prep, stick with jars that are made for hot pickling liquids.

3-Third Step: Make the brine In a small saucepan, combine the vinegar, water, sugar, salt, black peppercorns, mustard seeds, and fennel seeds if you are using them. Bring the mixture to a boil and stir until the sugar dissolves. The brine should smell sharp, salty, and a little sweet at the same time. At this stage, you can adjust the sugar to fit your taste. Some people like the lower end at 1/4 cup, while others want a sweeter pickle slaw and use closer to 1/3 cup or a little more. If you are watching sugar, start low and taste the brine before pouring it over the vegetables.

4-Fourth Step: Pour and cover Immediately remove the saucepan from the heat and pour the hot brine into the jar or jars. Make sure the vegetables are mostly covered so they can pickle evenly. If the cabbage floats a little at first, that is okay because it will soften and settle as it cools. Place the lids on the jars, but do not tighten them yet. This gives the jars room to release heat safely while they cool down. Once they are cool enough to handle, tighten the lids and move them to the refrigerator.

5-Fifth Step: Chill and marinate Refrigerate the jars for at least 24 hours before serving if you want the best flavor. You can eat the slaw sooner, but the taste becomes deeper and better after the vegetables have sat in the brine for a day. This Sweet & Spicy Pickle Slaw keeps in the fridge for up to 3 weeks. The flavor stays bright, crisp, and punchy during that time, making it a great make-ahead side dish for tacos, BBQ plates, sandwiches, and grain bowls.