First, include fava beans in your vineyard's winter cover crop. Fava is a pretty, useful plant; when plowed under in the spring, it enriches the soil with nitrogen. (Owning a vineyard in Napa Valley is the only costly part of this method, but it will also work in your winter garden.)
Then, you wait for late spring when the beans are ready to harvest - taking care to warn your vineyard manager that you want to save a patch so he doesn't innocently mow all of them down before disking the vineyard.
Shell your beans and put them in the freezer. They'll be ready to peel effortlessly in 30 minutes and -- best of all -- they will keep indefinitely, frozen, to enjoy throughout the year. Here are some tasty recipes to make at home.