Slide a bead onto a sequin pin, mount the jig hook, and lash the pin along the top of the shank so the bead sits forward of the eye. This off-center weight is what makes the fly hang horizontal under an indicator.
Trim the pin, wrap a smooth thread base back to the bend, and lock everything down.
Tie in a full marabou plume at the bend as a tail one to one-and-a-half shank lengths long.
Spin the remaining marabou (or leech dubbing) in a dubbing loop, wrap forward as a shaggy body up behind the bead, then brush it out with velcro so it breathes.
Build a small collar, whip finish behind the bead, and cement.
Other versions
5 more in the app: Classic Recipe (2), Fly Fish Food Tie, variant 1, Fly Fish Food Tie, variant 2, Fly Fish Food Tie, variant 3, Fly Fish Food Tie, variant 4.