Doubling a recipe may appear straightforward, but it requires careful consideration. Many chefs recommend either preparing the original recipe in batches or meticulously adjusting seasonings, leavening agents, and alcohol quantities to maintain flavor balance. In reality, when doubling a recipe, various ratios need to be employed to achieve the perfect taste.
Procedure
Organizing the Ingredients

Jot down each ingredient on a piece of paper. Chefs advise against mentally scaling a recipe. It's best to write down the required amounts in advance.
- If you have access to a copier, consider duplicating the original recipe and annotating the margins to keep the instructions alongside the ingredients.

Organize the vegetables, flour, and meat in one column. Segregate the seasonings into a separate column and the liquid ingredients into another. Lastly, allocate rising agents and alcohol to the final column.

Label the main ingredients and liquids columns as 'Times 2'. For seasonings, except hot peppers, label as 'Times 1.5' and place them alongside the exacting ingredients such as rising agents and alcohol.

Complete the calculations below and cross-check your ingredient list from the original recipe to ensure nothing is omitted. Rewrite the ingredients in a list format based on the doubled quantities you've calculated.
Doubling Main Ingredients

Double the quantity of vegetables and fruits. These will constitute the bulk of your recipe. Record the new amounts in the first column.

Double the amount of flour in the recipe. Adjust the rising agent later based on the increased flour quantity. Note down the new flour measurement.

Increase the meat quantity you need to purchase by 2. Keep in mind that cooking larger meat pieces may require longer cooking times. Record the new weight measurement in pounds or grams.

Exactly double the number of eggs required.
Doubling Liquid Ingredients

Double the amount of water needed. Record this in the liquids column. If the original recipe calls for 2 cups of water, now you'll need 4 cups.

Double the quantity of stock. Note down this measurement in the liquids column.

Exclude alcohol-based ingredients like sherry, wine, beer, and spirits from the general ingredients list. Doubling these can result in an overly strong flavor due to concentration.

Regard ingredients such as soy sauce, Worcestershire sauce, and other concentrated sauces as seasonings. Adjust their quantities separately to ensure accurate measurements.

Double the amount of butter or olive oil specified in the recipe. However, avoid doubling the amount of oil or butter used for sautéing. Use enough to coat the pan adequately, adjusting for pan size.
Increasing Seasonings

Scale up your spices, such as salt, pepper, and cinnamon, by 1.5 times the original recipe. If your recipe requires 2 tsp. (12.2 g) of salt, you'll now need 3 tsp. (18.3 g) of salt. Consider using a calculator for precise measurements.

Increase the quantity of chili peppers and other spicy ingredients by 1.25 times the original recipe. This includes curry powders, garlic powders, and fresh hot peppers.

Ramp up salty, peppery, and concentrated sauces by 1.5 times the original amount. For sauces containing alcohol, consider increasing by only 1.25 times.
Increasing Special Ingredients (The Exceptions)

Use 1.5 times the specified amount of alcohol in the recipe. When doubling the recipe, avoid estimating quantities and rely on precise measurements.

Adjust your baking soda quantity accordingly. For proper rising, aim for 1/4 tsp. (1.15 g) of baking soda per cup (125 g) of all-purpose flour. If you're now using 4 cups (500 g) of flour, you'll need 1 tsp. (4.6 g) of baking soda.

Recalculate the amount of baking powder needed. Typically, you'll require 1.25 tsp. (4.44 g) of baking powder per cup (125 g) of all-purpose flour. With 4 cups (500 g) of flour, you'll need 5 tsp. (17.77 g) of baking powder.
Tips
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When doubling the recipe, increase the oven temperature by 25 °F (10 °C). Utilize a Fahrenheit to Celsius converter for the equivalent Celsius temperature.
Warnings
- It's best to avoid doubling batches of canned goods such as jam and pickles. These products require precise ingredients and cooking times to achieve the desired consistency and flavor. Stick to the original recipe and cook in batches.
Things You'll Need
- Pencil
- Paper
- Printed copy of the recipe
- Calculator
- Fahrenheit to Celsius converter