a build consisting of all Spy buildings (Typically Level 4 Guilds or Stronghold of Shadows) and one troop building (typically a balanced build to get the extra 2 attacks against OSF) Hansel have the advantage of being very small in Troop numbers which makes them all but impossible to attack (only the very small and other Hansels can attack them) while preserving the advantage of being able to attack very large OSF. Also, Hansel plunder id one of the best in the game is almost all made from ally plunder. So the Hansel's First attack and second attack are very similar in gold earned. Hansel is the preferred growth method for those trying to build an OSF or trying to get to T4 build as quickly as possible. Here is a good build Hansel Guide that takes you through the Hansel Method: viewtopic.php?f=6&t=57650
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T3 Hansel refers to a Hansel that is made up of all Level 4 Guilds and one troop building. Even though their are only 2 tiers of spy buildings many refer to Stronghold of Shadows as Tier 4 because they were released at the same time as Tier 4 buildings. Therefore Guilds became known as Tier 3. I have heard people refer to all SoS + 1 troop building Hansel builds as "T4 Hansel" and occasionally "Gretel Builds"