Harvest 4 cups of pansy blossoms into a heat-proof container. (No need to remove the sepals of bases, they are edible as well, and taste fine without the bitterness that you'll find in the sepals of other edible flowers).
Pour 4 cups boiling water over the top of the flower blossoms and allow the tea to infuse for about 10 minutes.
Strain the floral tea into a saucepan or jam pot. Add the lemon juice, which will help bring out the best color in the jelly, but it's also required to balance the sugar in the recipe and help the pectin set. Beyond that, it adds acidity to help preserve the jelly, so don't skip the lemon!
Bring the mixture to a boil and add the powdered pectin, stirring to dissolve. Allow the mixture to boil for 1 minute before adding sugar. (Note: Do not add the sugar at the same time as the pectin, or before the pectin, or the jell will not set.)
Add the sugar, stirring to dissolve (See notes on quantity). Bring the mixture back to a full boil for 1 minute before ladling into jelly jars leaving 1/4 inch headspace.
If canning, process in a water bath canner for 10 minutes. Otherwise, allow the jars to cool completely on the counter before storing in the refrigerator (for up to a month) or the freezer for up to 6 months.