Star Fill In
The star tip creates the most celebrated, easily accomplished decorations! The serrated edges of the star tip make ridges in the icing as you squeeze it out. Because fill in requires so much piping from the same bag, keep replenishing icing in bag.
Buttercream icing medium consistency
Fit the decorating bag with round tip 16 and fill 1/2 full with medium consistency icing. Hold the decorating bag straight up; the tip should be 1/4 in. above surface. Squeeze bag to form star. Pipe a row of stars evenly and close together. Adjust tip position slightly each time so that the points of the stars interlock and cover the area without any gaps. Stop pressure and pull tip straight up and away.
Pipe a row of stars beneath the first, again adjusting tip position.
Continue to fill in entire area. Increase or decrease pressure to change star tip size. Stars will be neatly formed only if you stop squeezing before you pull tip away.