Place sugar, lemons and raspberries into Thermomix bowl and chop 3 sec/speed 5.
Add 1 litre water and stir gently 10 sec/Reverse/speed 2. Strain mixture well, reserving solids.
Return solids to Thermomix bowl and add another litre of water. Stir 10 sec/Reverse/speed 2. Strain and add to first amount of liquid.
Dilute further to taste and serve over ice.
You can use sparkling mineral water for some of the water amount, but not all of it, as it will fizz up and spill over the rim of the Thermomix bowl.