Overwhelmed in Summer, not winter?

I own up to sowing more lettuce that we can possibly eat its the only thing I can't save, don't mention lettuce soup its not normal to eat cold soup.
Everything else is either frozen, jar or dehydrated that we don't eat at harvest time, hoping it will last us at least part way into winter. We soon eat up and are left with lettuce in the GH then kale, parsnips, JA's and chard outside. with the usual jams chutneys and pickles.
Windowsill sowings don't grow very fast in winter but I do try to get something from them.