Icing and frosting can add a sweet finishing touch to your favourite baked goods. Although there are many recipes available, there are several factors that are important to determine if icing can be displayed safely at room temperature or if it requires refrigeration.
Sugar level:
A method to ensure icing is shelf-stable at room temperature is to use a recipe with a minimum of 65 per cent sugar by weight. The easiest way to calculate the sugar by weight is to convert it into grams. Measure all ingredients using household measuring utensils (measuring cups, spoons, scale) and then convert it into grams. There are several websites online that make this process simple by providing weight equivalents for household measurements of general ingredients. If you are using a kitchen scale, remember to “zero out” the weight of the container prior to weighing each ingredient for accurate measurements.
Here are some calculation examples on how to calculate the sugar levels for your recipe:
Simple icing
| Ingredients | Weight in grams |
|---|---|
| 3 cups of sugar | 600 |
| ½ cup of salted butter | 113 |
| 2 tablespoons of milk | 30 |
| 1 tablespoon of vanilla extract | 4 |
| Total weight in grams: 747 | |
|
Sugar calculation: sugar in grams 600 / total weight in grams 747 x 100 = 80% |
|
Vanilla butter cream frosting
| Ingredients | Weight in grams |
|---|---|
| 3 cups of powdered sugar | 360 |
| 1 cup of butter | 227 |
| 3 tablespoons of heavy cream | 45 |
| 1 ½ teaspoon of vanilla extract | 5 |
| Total weight in grams: 637 | |
| Sugar calculation: sugar in grams 360 / total weight in grams 637 x 100 = 56.5% This frosting is below 65% sugar and therefore not stable at room temperature. |
|
Note: If the following ingredients/products are added to a recipe (even if sugar levels are above 65%), the final product would not be considered low-risk or shelf stable and would require refrigeration at 4°C or colder:
- Raw eggs in uncooked frostings or fillings
- Raw flour in uncooked frostings or filling
- Cream cheese frosting or filling
- Chocolate ganache
- Heavy cream frosting
- Lemon curd
- Fresh cut fruit or vegetables as garnishes
- Custard pie
- Cream pie
- Chiffon pie
- Fresh (unbaked) fruit pie, such as fresh strawberry pie
- Any meat pies/filling
- Other hazardous food items as determined by Ottawa Public Health
All food premises are subject to the requirements of the Health Protection and Promotion Act (HPPA), the Ontario Food Premises Regulation, and inspections by a public health inspector.
Source: Adapted and reproduced with permission from Durham Region Health Department