01 - Rinse the dandelion flowers thoroughly under cool running water. Remove all green base parts and stems, retaining only the bright yellow petals.
02 - Combine the yellow petals and water in a saucepan. Bring to a boil, then reduce heat and simmer gently for 10 minutes to extract the floral flavor.
03 - Remove the saucepan from heat and let the petal mixture steep uncovered for 30 minutes to develop a deeper flavor.
04 - Pour the mixture through a fine mesh sieve lined with cheesecloth. Press firmly to extract all liquid, then discard the spent petals. You should have about 3 cups of infused liquid.
05 - Transfer the measured liquid to a clean pot. Stir in the lemon juice and fruit pectin until fully dissolved.
06 - Bring the mixture to a full rolling boil over high heat, stirring constantly to prevent scorching.
07 - Add all of the sugar at once. Return to a rolling boil and cook for 1 to 2 minutes, stirring continuously until the sugar is completely dissolved.
08 - Remove from heat and skim off any surface foam. Immediately ladle the hot jelly into sterilized jars, leaving 1/4-inch headspace. Wipe rims and seal with lids.
09 - Process the sealed jars in a boiling water bath for 10 minutes for shelf-stable storage. Alternatively, let the jars cool to room temperature and refrigerate for immediate use.