We can definitely help, but it's super easy to do yourself.
Short version: sub out 2-row (aka Pale malt, Marris Otter, Golden Promise) for light DME or pilsener malt for pilsen DME; for every pound of grain you take out, replace with .66 pounds of DME. Make sure that you leave at least as many pounds of 2-row or pilsener as there are pounds of other stuff in there.
So if the recipe started with 12 lbs of 2-row, 1 lb of Crystal 60, and 1 lb of Biscuit Malt, you have to leave at least 2 lbs of 2-row in (because you have 2 lbs of "other stuff": crystal 60 and biscuit) but you could replace the other 10 lbs with 6.6lbs of pale DME; that'd make the partial mash version a PM of 2 lbs 2-row, 1 lb crystal 60, and 1 lb biscuit, then add 6.6 lbs of pale DME at start of boil.
Long version:
1. List out the grain bill. Let's say it's:
All-Grain Irish Stout
6 lbs British Pale Malt
2 lbs flaked barley
14 oz roast barley
2 oz acidulated malt
2. Figure out the base malt--this will generally be "pale malt", "2-row", "pilsner malt", or some specific type of one of those (e.g. Marris Otter and Golden Promise are types of 2-row). You will be substituting out for that: light DME (or LME) for 2-row, extra-light or pilsen DME (or LME) for pilsener malt.
In this case, we have "British Pale Malt". That's what we're subbing out. We will replace it with light DME. Just because it's British, we'll use Munton's brand--that's not a huge deal, though.
3. Figure out how much base malt you're getting rid of. In general, you want at least half the mash to be base malt. There are a total of 3 lbs of non-base grains (2 lbs flaked barley + 14 oz roast barley + 2 oz acid malt). So we want to leave 3 lbs of pale malt in the mash--that means we can substitute out 3 lbs of the pale malt for DME.
4. Multiply the amount that you're substituting out by .66 to figure out how much DME to replace it with, or by .75 to figure out how much LME to replace it with:
3 lbs * .75 = 2 lbs 4 oz of LME; or
3 lbs * .66 = 2 lbs of DME
We'll use DME, since it's easier to measure out. So we're replacing 3 lbs of British Pale Malt with 2 lbs of light DME.
5. Write down the new recipe:
Partial Mash Irish Stout:
3 lbs British Pale Malt
2 lbs flaked barley
14 oz roast barley
2 oz acidulated malt
Extract to add at start of boil:
2 lbs light DME
Done!
(open bar)... 3 weeks I will be kegging it and I will let you know how it turns out! Cheers
thanks!
