01 - Rinse the dandelion flowers thoroughly under cool running water. Remove all green parts from the flower heads, 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 floral flavor.
03 - Remove the saucepan from heat and allow the mixture to steep uncovered for 30 minutes, developing a deeper infusion.
04 - Pour the mixture through a fine mesh sieve or cheesecloth, pressing firmly to extract all liquid. Discard the spent petals. You should have approximately 3 cups of infused liquid.
05 - Transfer the measured infused 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 the granulated sugar all at once. Return to a vigorous boil and cook for 1 to 2 minutes, stirring continuously. Remove from heat and skim off any surface foam.
08 - Immediately ladle the hot jelly into sterilized jars, leaving 1/4-inch headspace. Wipe the rims clean and seal tightly with lids.
09 - Process the sealed jars in a boiling water bath for 10 minutes for shelf-stable storage, or let cool to room temperature and refrigerate for immediate use.