She didn't @clothmama, but she did ask about my cooking habits. I usually make stock (or have stock frozen) and/or use the veg. water. I make a flour roux in meat juices, then add stock (+/- milk, wine, juice etc. depending on what's at hand)
I save everything for stock pots (DH despairs of bags of bones int he freezer if I don't have time to sort them
), and cook everything from scratch. I have horrendous reactions to somethings, and a nut allergy, so its easiest this way...
I had actually figured that cooking lentils in a decent stock might be more digestible for a baby than flour (although, as you say cornflour isn't so bad), and adds in a bit more of the texture variation she was on about.