Prepare water bath canner, lids, rings and jars according to manufacturer instructions and safe canning guidelines before beginning to make the jelly.
Add the sugar to the pot. Heat this mixture on medium-high heat. Stir constantly until sugar has dissolved fully. Bring the mixture to a full boil, and boil for 3 minutes, stirring often. (While doing this, pour boiling water over flat canning lids in a separate small bowl, and let them sit for 5 minutes to soften rubber seal.
Stir in the pectin; return the mixture to a full boil. Boil it for 1 minute longer, then remove the pan from the heat. Skim off any foam that may have accumulated on the top of the jelly. Add drop of food coloring to achieve the color you desire (optional). Stir to combine.
Pour the jelly into hot, sterilized half pint (8 oz.) jars. Fill the jars to within 1/4 inch of the top. Insert plastic knife into jelly to help remove air bubbles. Adjust headspace in jars, if necessary. Wipe rims completely clean to ensure a good seal. Center the hot flat lid onto the jar. Screw the band on until it is fingertip tight.
Place jars on an elevated rack in a canner with simmering water (about half full). Make sure the jars are completely covered with water by at least one inch over the top.
Put lid on the canner. Bring the simmering water to a gentle boil, then process jelly in jars for 10 additional minutes. After 10 minutes, turn off heat; remove the canner lid. Wait for 5 minutes, then carefully remove hot jars (with canning tongs) to a dish towel on counter (do not place hot jars directly on kitchen counter as the glass might crack, due to temperature variations). Let jars sit, undisturbed for 24 hours before moving. You should hear a "ping" sound as each jar successfully seals. Remember to check to make you have a good seal on the jars before storing! If a jar does not seal properly, it cannot be stored in pantry. Place it in refrigerator, and use within a few weeks.
Jalapeño Pepper Jelly https://www.thegratefulgirlcooks.com/jalapeno-pepper-jelly/