I used a 4.5mm hook and a DK weight yarn (Mirasol T’ika) & my final square measures 8 x 8cm (3″ x 3″). Of course, the brilliant thing about grannies is that size isn’t important, so you can use any yarn and appropriate hook.
Although I am from the UK, I have written this pattern using USA terms – somehow they’ve become more natural to me – perhaps because so many of my pattern books are American. Here are my abbreviations with a translation for crocheters who are better with UK terms.
sc: single crochet (double crochet in the UK)
dc: double crochet (treble in the UK)
dc2tog: double crochet 2 stitches together (treble 2 stitches together)
dc3tog: double crochet 3 stitches together (treble 3 stitches together)
Start with a magic/adjustable circle (link takes you to youtube video).
Round 1: Chain 1 then make 8 sc in the ring. Join with a slip stitch.
Rnd 2: ch3, dc2tog in the same place, ch 5, dc3tog in 4th ch from your hook, ch1, skip 1 sc, *dc3tog in next sc, 5 ch, dc3tog in 4th ch from your hook, ch1, skip 1sc, repeat from * twice more, join round with slip stich in top of ch3 & fasten off.
Rnd 3: Join yarn in the space made by beginning of 5 ch in rnd 2, ch 3 (or make standing dc), 2dc, ch 2, 1 sc in ch 4 space, ch 2, 3 dc in next 1 ch space, ch 1,
*3 dc in next ch space made by the beginning of 5 ch, ch 2, 1 sc in ch 4 space, ch 2, 3 dc in next 1 ch space, ch 1, repeat from * twice more, join with slip stitch & fasten off.
Rnd 4: Join yarn in any 2 ch space before an sc (i.e. at any corner), ch 3 (or making standing dc), 2dc in same 2 ch space, ch 3, 3 dc in next 2 ch sp, ch 1, 3 dc in 1 ch sp,
*ch 1, 3 dc in next 2 ch sp, ch 3, 3 dc in next 2 ch sp, ch 1, 3 dc in 1 ch sp, repeat from * 2 more times then 1 ch, join with slip stitch & fasten off.