Begin by placing 2 to 4 cups of fresh mint leaves into a large bowl. Pour 4 cups of boiling water over the mint and add 2 tablespoons of lemon juice. Steep until cooled to room temperature, about 30 minutes, then refrigerate for 24 hours.

After steeping, strain the mixture using a fine mesh sieve to collect the liquid, discarding the leaves. You should have approximately 4 cups of vibrant mint tea.

In a large pot with the strained mint tea, add the powdered pectin and stir well. Heat over medium to bring to a gentle boil, stirring occasionally.

Gradually stir in the granulated sugar, ensuring complete dissolution before adding more. Bring to a boil again and let it thicken for 1 to 2 minutes.

Ladle the hot mint jelly mixture into sterilized jars, leaving 1/4 inch headspace. Wipe the rims of the jars clean before securing the lids tightly.

Process the jars in a boiling water bath for 10 minutes, ensuring they're fully submerged. Remove and cool undisturbed for 24 hours.