01 - Rinse the dandelion flowers thoroughly under cool running water. Pull away all green base and stem portions, keeping only the bright yellow petals.
02 - Combine the petals and water in a saucepan. Bring to a boil, then reduce heat and simmer for 10 minutes.
03 - Remove the saucepan from heat and let the mixture steep uncovered for 30 minutes to develop full floral flavor.
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 liquid to a clean pot. Stir in the lemon juice and fruit pectin. Bring to a full rolling boil over high heat, stirring constantly.
06 - Pour in the sugar all at once. Return to a rolling boil and cook for 1 to 2 minutes, stirring continuously to prevent scorching.
07 - Remove from heat and skim off any surface foam. Ladle the hot jelly immediately into sterilized jars, leaving 1/4-inch headspace. Seal with lids.
08 - 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.