Place 2 tsp. per cup of plain red rooibos tea in a heatproof container along with some fresh or dried mint leaves. Add some lemon or orange slices, raspberries or strawberries and some stevia leaves to sweeten. Pour boiling water into the container and steep till cool. Strain tea leaves and pour over ice or finish cooling in the fridge. Put the lemon slices back into the drink if desired.