01 - Rinse the dandelion flowers thoroughly under cool water. Pull away all green sepals and stems, 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. Remove from heat, cover, and let steep for 30 minutes.
03 - Pour the mixture through a fine mesh sieve or cheesecloth, pressing firmly to extract every bit of liquid. Discard the spent petals. You should have about 3 cups of dandelion infusion.
04 - Transfer the measured infusion to a clean pot. Stir in the lemon juice and fruit pectin until fully dissolved. Bring to a full rolling boil over high heat, stirring constantly.
05 - Pour in the sugar all at once. Return to a full rolling boil and cook for 1 to 2 minutes, stirring without pause to prevent scorching.
06 - Remove from heat and skim off any surface foam. Immediately ladle the hot jelly into sterilized jars, leaving 1/4-inch headspace. Wipe rims clean and seal with lids.
07 - Process 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.