I needed some for a planned Elderflower Saison, most for 25L of Elderflower Fizz (liked by SWMBO) and rest for some cordial.
I found a couple of good spots in the nearby countryside and picked about 180 elderflower heads.
After trimming off stalks I ended up with 1320g of florets.
I put 220g aside (in plastic bag & frozen) for Elderflower Saison, that left 1100g of florets for fizz/ cordial
I wanted to kill off any wild yeasts but not boil away flavour so I decided to pasteurise at 85C for 30 mins.
I used the LIDL jam maker / mash tun / boiler to extract flavour and aroma from the elderflowers as this has a facility to pasteurise,
i.e. set temp to 85c temp to 30C and click on then away you go.
I used my hop filter to stop florets getting in the cordial:
upside down showing holes

fitted

1100g Elderflower Florets

7kg sugar, 4 lemons + 30g citric acid

Add sugar

Add 7L water and stir. Start boiler. Set at 85C for 30 mins.

Use zester to add lemon rind

Add lemon juice

25 mins left to go at 85C

1 mins left to go at 85C

I left it in boiler for about another hour. No heat added but its insulated so it was 80C after an hour.
I couldn't drain to glass as I was worried it would crack with heat so I drained, via hop filter & silicone tube.
To other end of tube I fitted a fine nylon sieve and this was placed on a ss sieve to support.
It drained very easily (maybe syrup would be slow if cold), and was hazy but no bits were in it.

I got about 11L of Elderflower syrup. They I washed / sparged with 4L of cold water as florets were sticky.
This produced about 4L of second runnings, OK to store for a few days and use diluted 30-50% as a drink.
I added 20L cold (treated) water to 5L of the strong syrup to make 25L of Elderflower Fizz. OG 1041.
To this I added a 2 tsp yeast nutrient and a saison yeast starter. It was going steadily after 24 hours.
I realise amount of acid added may be a bit low, but I'll add later in the brew if it needs it.
This left about 6L that was bottled hot in clear swing-top bottles, for use as a cordial, or as additions to brews at secondary.
Last job, clean out Lidl MT/boiler. Filter worked well.
