Elderflower champagne

For the real Cambridge experience, drink while punting to Grantchester.

Mother's Black Book. Makes 5 litres. 3 steps

4 heads elderflower			Stand 24 hours. Strain, bottle in gas-proof bottles. Leave up to 1 month.
650g sugar
2 tablespoons white wine vinegar
5 litres water
2 lemons	lemons	juice
		chop rind coarsely

Trying: 8 heads, 8.5 litres, 1 lemon (no pith). 2T elderflower vinegar. 106g sugar + 400g sugar ish.