Four comments
This tune is similar to McNamara’s Hornpipe (also in G)
Bc|dBGB cAFA|~G3F GABc|dg~g2 eg~g2|dBGB A2Bc|
dBGB cAFA|~G3F GABc|dg~g2 ecAF|G2GF G2:|
|:Bc|dg~g2 eg~g2|dg~g2 edBc|dg~g2 eg~g2|dBGB A2Bc|
dBGB cAFA|~G3F GABc|dg~g2 ecAF|G2GF G2:|
"variations"
z2|dBGD cAFD|~G3D GABc|dg~g2 effe|dGGB A2Bc|
dB~B2 cBBA|G2GD GABc|d2g2 ecAF|GBAF G2:|
|:z2|dg~g2 effe|dg~g2 effe|dg~g2 effe|d^c=cB A2Bc|
dB~B2 cBBA|~G3D GABc|d2~g2 ecAF|GBAF G2:|
The tune you speak of is here https://thesession.org/tunes/3564.
This is a really infectious tune. That last turnaround sticks in my head for weeks after hearing it in a session.
The triplet at the start is best played as (3DEF.