Wash the brambles and put them into a pot with a little water....the remaining water on the brambles is usually enough, but err on the safe side and maybe add a cm to the bottom of the pot.
Bring up to a simmer and keep it there for maybe quarter of an hour or so...if you use the tattie masher on them when they're soft it speeds things up a bit.
If you have a jelly bag, then now's the time to use it. If you don't, find a colander and line it with something like an old, washed free of any soap and detergent, folded in two, teatowel that you don't mind sacrificing. It'll end up purple and that stain will fade to a lavender grey colour. It'll just look filthy for ever afterwards, though bleach will help clean it up.
Anyhow, the juice that collects in the bowl/pot/jug, needs to be measured and the same amount of sugar added. So if you get a litre, add a kilo.
Prep your bottles beforehand, have them washed and then heat them up in the oven. Not hot/hot, you don't want the syrup to boil when it's poured into the bottles, but hot enough that they won't crack when the hot syrup is poured into them.
This is where you have to mind that you're making syrup and not jelly. Bring the juice and sugar slowly up to a boil making sure that the sugar is fully dissolved, and only keep it there for a minute or two. You don't want set syrup in bottles, trust me on this, you really don't
Move the pot off the heat, and stir gently. If the syrup needs skimmed, then as the temperature falls the liquid will shrink a bit, and it's easy to encourage the skimmings to the side where they can be removed.
While the syrup is still hot pour it into bottles and seal.
Keep cold until used, then be careful not to tighten the lid too much on a half used bottle in case it ferments. It ought not, but after all the years of me making and using this stuff, a bottle of blackcurrant exploded in my kitchen earlier this month. The mess was unbelievable. I'd used Kilner bottles with swing cap lids too, and thought they'd blow before the bottle would.
I reckon I'd have been better sticking to old washed out sauce bottles.
The opened bottle hadn't been put in the fridge or pantry, and it was scorching hot that week. I think that was all the encouragement that the stuff needed.
However, the syrup is really good
and worth the effort
M