This beer from St. Peter's is a ruby brown ale under an oddly ivory head. I've never seen an ivory head: tan plus hints of green-grey. This is old style, like Burton Bridge porter: barley candy plus molasses with lime and green hops. The yeast is sour cream or soured milk or something in between. Yet all well balanced.
Is this the holy grail? A 1750s porter? Likely not sour enough but colonial US farmers drank diluted vinegar so go figure.