Mix together and blend to puree all berries. Place in small saucepan and heat on low heat, slowly mixing in the 1 tbsp of stevia. Mix until slight bubbling occurs; at which point, reduce heat until ready to be served.
Store extra in a small glass jar, which can be kept in the fridge for up to two weeks. We use this on pancakes, desserts, and yogurt.
To stay in ketosis, you must use very little syrup (1 tbsp per serving). Consult your nutritionist or coach on the amount that is allowed in your macros.