Combine the petals, water, and zest in a small pot and bring to a simmer. Simmer for 5-10 minutes then let cool to room temperature. Transfer to a container and refrigerate at least 6 hours and up to overnight to continue to steep.
Strain through a fine mesh strainer back into a measuring cup, pressing to extract as much liquid as possible. Discard the solids. You will need 2 cups of strained liquid so add a bit more water, if needed.
Transfer the strained mixture to a pot and add the lemon juice, pectin, and salt while whisking to incorporate. Bring the liquid to a boil. Add in the allulose and return the mixture to a boil for 2 minutes. Remove from heat and pour into jars. Refrigerate overnight and up to 2 days to allow the mixture to set. Will keep for 3 weeks refrigerated.
Notes
If the jelly doesn’t set after 2 days,, you can try recooking it, otherwise use it as a syrup or honey flavoring.makes 2 cups, serving size: 4 tablespoons