Page 169 - Mario Bigon "The Morrow Guide to Knots"

Method
Place the two ends
alongside one another
(1). Take the end to the
left and make two turns
around the other line
(2). Now bend the left
end back and insert it
between the two lines
at the point where they
crossed initially (3).
Repeat this process
with the right end (4).
The knot is now
complete but loose (5);
before pulling it tight,
check that it is perfectly
symmetrical. The knot
can then be drawn up
by pulling the ends and
then the standing parts
of the two lines (6).

6