Very easy, quite a few flowers there is an ikea bowl that large about the size of a medium saucepan I use for this. Then boil the kettle add the boiling water to the flowers stirring for 5 or so minutes then add some sugar or honey according to taste I add lemon too, stir to dissolve the sugar wait for it to cool down a bit then add a load of ice and and enjoy. They sell a cordial syrup of it in shops here do there probably is a way to make it strong enough to keep it long term. However I just make it fresh. Just play around with it and you will reach the right proportions as I am lazy with my recipes 😉

Thank you!