Place the raspberries and sugar in a bowl and mash them together until well combined, using a muddler or a fork.
Let the mixture rest for 10 to 20 minutes.
Add the water and stir until well combined.
Strain the mixture through a fine mesh strainer or a cheesecloth. If using a cheesecloth, you will need to pull the corners together, twist the top and squeeze the mixture through with your hands. This will be the fastest way to strain.
Bottle the strained liquid in a clean bottle or mason jar. It will keep in the fridge for a couple of weeks.
Make the Raspberry Mocktail
Add the Raspberry zinger tea, Fresh Raspberry syrup, lemon juice and egg whites to a cocktail shaker. If you have the spring of a cocktail shaker or a blender ball, add that as well.
Shake the mixture without ice to develop the foam. Then, add ice to chill everything and shake again.
Strain the mixture into a cocktail glass.
Garnish with a lemon wheel and fresh raspberries and serve immediately.
Notes
You can make the syrup low-sugar by substituting the sugar with 100 grams of allulose (½ cup).
Convert this recipe to a cocktail by adding 1½ fl oz white rum, vodka or gin in place of half of the raspberry tea.