01 - Rinse the dandelion flowers thoroughly under cool running water. Remove all green parts from the flower heads, retaining only the yellow petals.
02 - Combine the yellow 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 for 30 minutes to extract maximum floral flavor.
04 - Pour the mixture through a fine mesh sieve or cheesecloth, pressing firmly to extract all liquid. Discard the spent petals.
05 - Measure the reserved liquid, which should yield approximately 3 cups. Pour into a clean pot.
06 - Stir in the lemon juice and fruit pectin. Bring to a full rolling boil over high heat, stirring constantly.
07 - Add the sugar all at once. Return to a boil and cook for 1 to 2 more minutes, stirring constantly to prevent scorching.
08 - Remove the pot from heat and skim off any foam that has formed on the surface of the jelly.
09 - Immediately pour the hot jelly into sterilized jars, leaving 1/4-inch headspace. Seal with lids.
10 - Process the sealed jars in a boiling water bath for 10 minutes for long-term storage, or allow to cool and refrigerate for immediate use.