Begin preparing the tzaziki a few hours before serving. The flavours
need time to blend. Marinate the meat overnight to absorb the wine and
garlic.
Souvlaki: Place the meat in a large bowl. Pour in the wine and sprinkle minced garlic and oregano. Imbed the lemon strips among the cubes of meat and drizzle with olive oil. Cover tightly with plastic wrap and refrigerate 12 hours or overnight. Shake or stir the mixture several times during
the marination period.
Tzaziki: Line a colander or sieve with cheesecloth (or gauze) and set it over a bowl. Pour in the yogurt and allow it to drip for an hour or so. After the yogurt has drained, combine it, in a small bowl, with the cucumber and the garlic. Cover the bowl tightly with plastic wrap and refrigerate until just before serving. While the meat is BBQing, drizzle the olive oil over the surface, and without stirring, sprinkle on the salt.
To Freeze: Freeze in freezer safe container.
To Reheat: Grill until done. Spoon Tzaziki on top.