The Holy Grail is apparently a caddis emerger pattern. I have not used this fly, but someone said they would like to see my take on one, so I put together this video of my tying. Lots of potential for variation on this pattern.
Pattern:
Hook: Fulling Mill FM5060 Czech Nymph Size 14
Bead: Gold brass bead 3/32" (2.4mm)
Thread: Semperfli Classic Waxed 12/0 Red
Rib: Semperfli 0.2mm Wire Bright Gold
Body: Fulling Mill Eco Warrior Dub Hare's Ear
Thorax Cover: Natual Cock Pheasant Tail
Thorax: Fulling Mill Eco Warrior Dub Pepper Box
Hackle: Partridge