Van de Kamp's Birthday Cake roses... What were they made of?

In Southern California grocery stores, you used to be able to buy white cake/white buttercream frosted birthday cakes from Van de Kamp's bakery. They would always have two roses on them with green leaves. The roses were slightly hard on the outside but almost marshmallow-like inside. They had a great... show more In Southern California grocery stores, you used to be able to buy white cake/white buttercream frosted birthday cakes from Van de Kamp's bakery. They would always have two roses on them with green leaves. The roses were slightly hard on the outside but almost marshmallow-like inside. They had a great taste.

I can't figure out what type of frosting they were made of. I'd love to try to replicate them.

Thanks!
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