Step 2: Make the Syrup

Juice grapefruit, pour juice through hand or sieve (to remove seeds) into measuring cup. There should be about four ounces of juice. Place juice in measuring cup, and add enough water to bring the amount of liquid to 1 cup.

Heat juice and sugar in saucepan, stirring thoroughly until fully incorporated.

Allow to cool.
Is it possible then to make a ginger/lime/tulsi flavor soda by just boiling the prior with some sugar then sodastreaming it?
I'm not acquainted with tulsi (at least I wasn't, until I looked it up on teh internetz just now). I'd probably treat your flavoring as tea. Try this: <br> <br>Bring a little water to a boil, add ginger, lime zest, and tulsi to the boiling water, stop boil, let this mixture steep as you would tea (the tulsi and ginger may take longer than tea to infuse the water--experiment). <br> <br>In a separate pan, make your sugar/water syrup, adding the lime juice to the sugar syrup. Strain ginger/lime zest/tulsi mix into sugar syrup, mix, let cool. <br> <br>Sodastream some water, add a small amount of the mix to a glass, add seltzer to glass. See elsewhere for ChuCraft's Instructable on SodaStream mixes, and how she uses an old SS bottle for measuring out: https://www.instructables.com/id/Make-your-own-Sodamix/
That's a good idea as well, ancienthart. I thought I would experiment first, with existing fruits and such in the pantry (hence the use of grapefruit), before looking at cordial concentrates. I'll look into fruit cordial recipes. Thanks!
My wife and I make plain soda water with our SodaStream, and pour it over concentrate cordials from the shop. In Australia we have a couple of very nice ones made by Bunderberg Ginger.<br>Maybe an easier route for you would be to make some home-made fruit cordials instead of soda syrups?

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