Video tutorial here :

Popcorn: 5 dc in next st, drop loop from hook, insert hook in first dc of 5-dc group, draw dropped loop through st, ch 1 tightly to secure.

Ch an even number of stitches very loosely.

Foundation Row: 1 sc in 2nd ch from hook, 1 sc in each ch across row, turn.

Row 1: Ch 3 (count as first dc), skip first st, *popcorn in next st, 1 dc next st, rep from * across, turn.

Row 2: Ch 1,2 sc in first dc; *skip next popcorn, 2 sc in next dc, rep from * across, ending with 1 sc top of turning ch, turn.

 

Rep Rows 1 and 2 for pattern .