# 🍺 Top-down Brew: Codes for Recipes

## Overview

The codes used by the beer engine are documented and explained. Ingredients that require multiple values, like malt and hops, need commas inbetween the values (comma separated values). Each code includes a definition, the conceptual form, and an example. The code format has changed since the 2024 version to make understanding more straightforward.

## Code Dictionary (in alphabetical order)

dme:
  For partial mash recipes with fixed dry malt extract weight
  dme: weight

      dme: 1

dry:
  Dry hopping with name and dosage
  dry: name, grams per liter

      dry: Cascade, 2

eff:
  Mash efficiency percentage, typically between 65% (BIAB) and 90% (continuous sparge)

      eff: 75

hop:
  Boiled hops
  hop: name, percent of IBUs, alpha acid percentage, boil time in minutes

      hop: Cascade, 70, 5.5, 60

ibu:
  The desired bitterness expressed in international bittering units
  ibu: bittering value

      ibu: 25

lateboil:
  Herbs, yeast nutrients, fruit, or late boil ingredients. The dosage units can be ounces/gallon or grams/liter.
  lateboil: name, dosage (ounces/gallon or grams/liter)

      lateboil: yeast nutrient, 1

lme:
  For partial mash recipes with a fixed weight of liquid malt extract
  lme: weight

      lme: 3.3

malt:
  Entry of malts (base and specialty) and adjunct grains
  malt: name, wort gravity percentage, lovibond, yield (either percent or SG)

      malt: Rahr two-row malt, 90, 3, 80

name:
  The name of the beer
  name: title

      name: My Favorite Beer

og:
  Original gravity in either specific gravity (1.xxx) or degrees Plato
  og: gravity

      og: 1.050

      og: 12

prime:
  Priming sugar calculations based upon desired volumes of CO2 and fermentation maximum temperature
  prime: volume of CO2, highest fermentation temperature

      prime: 2.5, 72

sugar:
  Sugars (dry or liquid) and malt extract
  sugar: name, wort gravity percentage, lovibond, yield (either percent or SG)

      sugar: sucrose, 5, 2, 100

system:
  The desired measurement system, metric, US, or barrels

      system: US

vol:
  Target volume at the end of the boil
  vol: desired liters, gallons, or barrels

      vol: 5

yeast:
  Type of yeast
  yeast: ale or lager

      yeast: ale