Friendship Starter And Bread

My sister-in-law gave me a recipe for Amish Friendship Bread along with a
jar-full of the starter mix. Here is the recipe:

***Do not use metal spoon ***Do not refrigerate dough!!

day 1 — Get starter and do nothing day 2 — Stir once each day with wooden
spoon day 3 — Stir once each day with wooden spoon day 4 — Stir once each
day with wooden spoon day 5 — Add 1 cup flour, 1 cup sugar, 1 cup milk and
stir day 6 — Stir once each day with wooden spoon day 7 — Stir once each
day with wooden spoon day 8 — Stir once each day with wooden spoon day 9
~- Stir once each day with wooden spoon day 10 – Add 1 cup flour, 1 cup
sugar, 1 cup milk and stir.
pour into containers of 1 cup each and give to 3 friends
with copy of recipe (or 2 friends and keep 1 start for yourself)

Pour into 2 well greased and sugared loaf pans. Bake 40 to 50 min. at 350
degrees. Cool 10 minutes before removing from pan. The bread may be
frozen for a later date. (note the starter)

Okay, this is my question: what’s the starter recipe? Is it a secret? or
is it just 1 cup flour, 1 cup sugar, and 1 cup milk? It sure smells good!
thanks!