I always recommend preparing cut up fruits and vegetables as an easy-to-grab option, and with Rosh Hashanah coming up, there will be many cut up apples being left to brown.
One method to prevent browning, is using honey water, which is quite fitting for the holiday.
Simply mix 2 tablespoons of honey with 1 cup water. Let the fruit soak for a few minutes and the fruit should keep from browning for about 24 hours.
Test it out and let us know your results!