A pastry bag is called for whenever a recipe asks the chef to pipe semi-solid foods. This is generally a matter of aesthetics, most famously cake decoration.
Once the proper tip is installed, fill the bag through the end with the wider opening, roll or twist it closed, and then squeeze it like a tube of toothpaste (from the top down, keeping the lower portion bulged out) to pipe its contents.
Though a circular nozzle is quite useful for making round shapes, many types of tip are available. The tip shown in the far left of the photo is a hypodermic-shaped one for filling pastries such as cream puffs, and many other types of nozzle are available for making star, leaf, and flower-petal shapes.
Aside from icing, pastry bags are commonly used to shape meringue and whipped cream, and to fill donuts with jelly or custard. When presentation is especially important, fluted tips can be used to shape savory foods such as filling for deviled egg, whipped butter, and mashed potatoes.
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