
For red pepper jelly, just use all red peppers.
1 small bell pepper each of red, yellow, and orange; half a jalopeno
1 cup cider vinegar
pinch of salt
5 cups sugar
2 pouches Certo liquid pectin
Chop peppers. Measure out two cups of peppers and juice. Cook with vinegar and salt about ten minutes, until peppers are soft, in a large pot.
Add sugar, stirring. Bring to a rolling boil and cook for one minute. Remove from heat and stir in pectin. Stir for five minutes to ensure pepper pieces are evenly distributed (this never works for me; they always float.) Fill prepared jars, leaving half an inch headspace. Process for five minutes in hot water bath. Allow to cool 24 hours.
If the peppers floated during processing, you can turn the jars occasionally during cooling to redistribute them.
This recipe is not hot. If you want more heat, add in more jalopenos and take out some of the other peppers in a more-or-less even mixture. If you want less heat, leave out the jalopeno entirely. Mind you, the single jalopeno in there doesn't make the jelly particularly hot; just adds a bit of surprise.
I've never tried it with banana peppers instead of yellow; it might work just fine.