FabbriSur La Table Amarena Cherries, 21 oz.

Would these be great to use in a black forrest cake?

How many calories for each cherry (or ounce)?

I have a jar that i received as gift xmas 2020. it has not been open. do you think it is okay to eat one year later?

When I mix these cherries into my old fashion, some white "crust" appears on the cherries. Is this ok?