I mash my starter wort rather than using extract, in part for the cost and in party because I pressure can it so I can make starters quickly without having to boil and chill every time. I make a1.040 wort using full volume BIAB, then can it on quarts, pints and half pints. I mash at 148 for a couple hours to create a highly fermentable wort. I happen to be doing this at this very second.
"Oh don't give me none more of that Old Janx Spirit/No, don't you give me none more of that Old Janx Spirit/For my head will fly, my tongue will lie, my eyes will fry and I may die/Won't you pour me one more of that sinful Old Janx Spirit"