Yarn: Schachenmayr Catania, Colour: Golfgrün 0241. Buy the yarn here.
Crochet hook: US E (3.5mm)
Rnd 4: ch3, 1tr = * 1tr, 2dtr, 1trtr, 2dtr, 1tr around a ch5 * around. End with 1 sl st in top of 1st tr (=3rd ch at beg). Cut the yarn and pull the thread through the sl st. Change colour.