1) Making it in a cafetiere
2) 300ml ish
3) 800ml for 3 heaped spoons
4) Pre ground http://www.taylorscoffee.co.uk/products/lifestyle-coffee/hot-lava-java.asp
Leaving it to brew for around 5 minutes before pushing the plunger down, not using boiling water as I heard this burns the beans? It is strong just not as strong as expected.
Ok then. 800ml means around 48g of coffee as a base line, but could go up to 64g with the same amount of water at the maximum really.
I'd recommend getting a basic set of digital scales *1g accuracy is fine* Start with a ratio of 48g coffee to 800g of water, and a brew time of 4 minutes. It's a good starting point.
Heat up the french press with water from the kettle *let it boil then leave it for ~1minute - boiling water burns coffee and tastes really nasty* Ditch that then add the coffee and the water on top and stir a couple of times to wet all the grounds.
Add the press in and use it to submerge the grounds into the water, don't compress it all the way, just 5mm or so. Ensures that all the grounds are extracted rather than just the ones not floating on the surface.
After 4 mins brewing, press and pour. Don't leave any in there as it will continue to extract. You can decant it into something else if you want to keep it for a few minutes.
No I wouldn't try it either, if nothing else a conduction hob might shatter the glass, and if not then definitely leave it blackened underneath! And an induction hob just wouldn't DO anything! I think the one in that shop had a flattened bottom for the lower container though, so I suppose you could use it without its stand.
Wouldn't be my choice tbh. Flat bottomed syphon sounds interesting though.