The pattern works for most wool and hook sizes, just match your hook to the label on the yarn.
Start by making a magic ring and chaining 1.
Round 1: 3dc, 1hdc, 2sc,1dc,2sc,hdc, 3 dc into ring. Chain 1 and sl-st into ring, pull to close.
Round 2: ch1, sc into chain space before the first dc of the last round. 2hdc in each of the next 3 sts, 3hdc, (hdc, dc) in next st, (dc, hdc) in next st, 3hdc, 2hdc in next 3 sts, sl-st into chain space, finish with an invisible join into the 1st sc.
Fasten off and weave in the ends (or use the ends to attach the heart to a hat or other work).