Why was there not enough foam in my garlic foam with soy lecithin? This was my first attempt at making a foam using soy lecithin. I used 3 garlic cloves, 2/3 cup water, 2/3 cup milk. Then i used an immersion blender. I got a bit of foam on top but there wasnt a lot of it. It felt like a waste of a lot of milk. How much foam should I be expecting? 

For now, I put the foamy mixture in the fridge, is there a way to salvage and get more foam?
Just an idea... I've had problems making foam because of hard/basic tap water (a lot of chalk in the water) - making frape though, not garlic foam:) Foam will more easily form in soft water as you can easily test with a piece of soap. If you have hard tap water you could try using boiled water (some of the chalk in the water will react and leave a residue on the bottom of the pot) or bottled water with pH 7 (neutral). Another idea would be to add just enough acid for neutralisation but I imagine that could be a bit tricky and you'd risk the milk curdling so I wouldn't recommend it.