In a bowl , mix together the condensed milk and half the lemon curd ( 1/4 cup) until smooth
In another larger bowl , whip the cold cream to medium or soft peaks
Fold in about 1/3 of the curd- condensed milk mixture into the whipped cream gently
Fold in the remaining mixture in 2 or 3 additions , folding each time gently until the colour is uniform
Fill the ice cream into a 9 x 4 inch loaf pan or any freezer friendly container
Add the remaining lemon curd on top and swirl it into the icecream base using a knife
Cover and freeze for 5 hours or overnight