Boston Apothecary

April 9, 2010

sweet potato ginger beer

Filed under: non-alcoholic — Tags: , , — sjs @ 10:14 pm

ginger beer

ginger beer has definitely come back into vogue lately, but i don’t think its full creative potential has been realized.  the uniqueness and pungency of ginger yields an intense emotional response that begs to be explored.  when you really investigate the mechanics of ginger beer, the simple seeming component of the “dark and stormy” or “gin gin mule” isn’t so simple.

for starters carbonating is hard but that is the least of the problems.  the ginger aroma is quick to degrade in certain environments and without knowing what they are, developing a recipe can be a lot of frustration.  in darcy o’neil’s incredible book “fix the pumps”, he explains that ginger cannot tolerate sucrose solutions or a PH that is too low.  this means a recipe needs invert sugars (not that hard to do) and can’t be comfortably acidified for stability. so i guess it needs to be sold before it spoils in a week.

the flavor of ginger beer is also a little more complicated that just ginger.  spiciness is often bolstered by capsicum to add depth which i’m sure will take a few iterations to get right.  i also have a feeling horseradish might also be able to add a similar amount of spicy depth.  spatial effect can also be enhanced by adding malt or honey to create aromatic backgrounds or even… sweet potato water! (water sweet potatoes were boiled in. similar to the guyana beverage “sweet potato fly”)

to make this all actually happen in a bar with any quality or economic viability, a recipe is going to have to be kegged and put on draft as well as nearly non cooked because you can’t tie up a stove in the kitchen for too long.

you also need an accurate sense of your turnover. a three gallon recipe will give you 75 or so 5 oz. portions.  if you fill it every few days you can probably keep everything fresh and sanitary which is important because components won’t be sterilized by cooking.

the foundation of a recipe is ginger and sugar in carbonated water.

my recipe needed nearly a quart of ginger juice per three gallons. with the right tool for the right job juicing ginger can be pretty easy.  grate the root in a cheese greater then put it through a centrifugal juicer like an Acme.  if your trying to make a gallon of juice you could probably even basket press the grated ginger.  the juice can easily be frozen and parceled out later so you only juice the ginger once a month.

if you choose to terrace the spiciness with capsicum, you can make a very potent high alcohol chili tincture and dole it out by the drop. horseradish could be treated just like the ginger.

the sugar content is fairly easy to figure out by looking on the nutritional facts on the backs of commercial bottlings and emulating their success.  ginger beer sugar is in the range of 100 to 150 grams per liter.  this could be weighed out and inverted in large highly concentrated batches then frozen just like the ginger juice.  you would have to be in the kitchen only once of month granted you have enough freezer space.

the contrasting back drop could be opportunistic.  maybe you have staff meal sweet potatoes, maybe you don’t. maybe you had enough space to freeze that as well.  using nothing isn’t a bad idea either.  a.j. stephens brand “boston” ginger beer is my favorite and seems to be really minimal.

toss it in the keg and gas it up like a lager.  14 psi at fridge temp is a good start but this could be adjusted based on foaming.

not everyone has a spare draft line but if you serve enough, even factoring in labor, making your own ginger beer could give you artistic freedom and save money.

after a couple more production iterations i’ll post a more formal recipe.

my vision for aromatic adjuncts so far are hopping the brew and using malta goya as my malt flavor source (similar to my fake genever recipe which relies on distilled malta goya)

March 25, 2010

elusive high pressure bottling…

Filed under: non-alcoholic — Tags: , , , — sjs @ 3:20 pm

this is a cautionary tale… any advice would be appreciated.

for quite a while i have dreamt of the idea of bottling high pressure sodas in champagne bottles within a restaurant scenario. ginger beers, sparkling lemonade, sparkling versions of still wines, or maybe hibiscus soda that resembles the structure of prosecco.

so far carbonated with yeast, but only ended up with sulfurous yeasty brut sodas (but the carbonation was flawless!).  i’ve tried to come up with manifolds like the tap cap or perlage system to force carbonate single bottles, yet have had little success. this all led me to attempt more traditional keg to bottle force carbonation.

the first problem was to develop a proof of concept experiment using only water.

to bottle something resembling champagne the beverage would have to be 60 psi at room temp (though i’ve heard some champagnes can top out at 80).  in the fridge, with the same amount of dissolved gas, the pressure will be lower but how low exactly is tricky to figure out (i can’t find any tables that explain the relationship…).  my fridge is cold, maybe just above freezing in the high 30’s.  what do i have to set the pressure at if i want it to expand to 60 at room temp?  to figure this out i thought i’d simply carbonate the keg to 60 psi at room temp.  easier said than done.  it takes multiple days for the water to absorb the gas.  i actually don’t think i ever got to 60 on multiple tries.  one time i actually had a leak and found the entire just filled gas cylinder empty.  gauges will say you are at 60 but those are just measuring the pressure in the head space and not accounting for what is going on in the liquid.  after wasting a full tank i thought i’d just estimate a number in the fridge so i went with 40 psi at fridge temp.  i didn’t let it warm up to room temp to see what it hit, but i’m pretty sure i got to 40 and it would make a nice drink.

now we had to get the water out of the keg and into a champagne bottle.  many factors can thwart this being done.  my discharging tool was the highly regarded “blichmann beer gun”.  i was hoping that it would scale up the the pressure and do the job.  the beer gun applies no “counter pressure” and claims it doesn’t need to because it’s design reduces so much turbulence relative to other designs.  (youtube videos show it working really well for beer)

i thought i would lower the pressure and push the highly carbonated liquid at a much lower pressure out of the keg. unsuccessful.  you could see at the very beginning of the hose that the gas was coming out of solution (we started at 5 psi maybe).  gas came out of solution until we turned the pressure up to the 30’s.  apparently counter pressure is critical.  we probably need everything colder as well.  the rig is large and probably needs a colder fridge and a large ice bath.  probably two stock pots of salted ice which is more than i keep in the house.

at 30 psi we were able to keep the gas in solution, but we had not even pulled the trigger yet.  the liquid immediately starts to lose gas as it rockets out the valve.  30 psi is a lot of pushing power.  i surmise that if there was anything dissolved at this pressure it would foam to death.  a solution would be to concentrate the flavoring,  dole it out to the bottles, and freeze it to the bottoms.  after getting the water in the bottles the frozen flavoring will warm up and dissolve.

the soda water we were left with wasn’t bad, but my bottling plant isn’t ready for prime time.

what i think i really need is a bottling apparatus that does counter pressure really well. i think i’m going to have to try a traditional design.

i’m also going to retreat to ginger beer which is bottled at a pressure slightly above beer.

you live and you learn…

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