3.25 cups (800 ml) water, or more as needed
4 cups (940 ml) lightly packed dandelion petals, divided
2 tablespoons lemon juice
1 (1.75 ounce) package powdered fruit pectin
1 drop yellow food coloring
4.5 cups (900 g) white sugar
Step 1
In a large pot, bring water to a simmer. Add 2 cups of dandelion petals and simmer for 10 minutes. Remove the petals with a slotted spoon and strain over a bowl, squeezing out as much liquid as possible. Discard the petals. Repeat with the remaining 2 cups of petals.
Step 2
Measure out 3 cups of dandelion-infused water, adding tap water if needed, and pour into a large pot. Add lemon juice, pectin, and yellow food coloring. Bring to a rolling boil, then add the sugar. Return to a boil and cook, stirring constantly, for about 1 minute. Remove from heat and skim off any foam if needed.
Step 3
Fill hot, sterilized jars with the jelly, leaving 1/4 inch of space at the top. Remove any air bubbles by running a clean knife or thin spatula around the inside of the jars. Wipe the jar rims with a moist paper towel, then top with lids and screw on rings.
Step 4
Place a rack in the bottom of a large pot and fill halfway with water. Bring to a boil and lower the jars, spaced 2 inches apart, into the boiling water using a holder. Add more boiling water if necessary to ensure the water level is at least 1 inch above the jar tops. Cover the pot and process for 7 minutes at a rolling boil.
Step 5
Remove the jars from the pot and place them several inches apart on a cloth-covered or wooden surface. Press the top of each lid with a finger to ensure a tight seal. Let the jars cool for about 24 hours.