The secret to make scalloped potatoes without curdling the sauce (2024)

FAQs

How to prevent scalloped potatoes from curdling? ›

The best way to prevent curdling in scalloped potatoes is to start with high starch potatoes, such as Russets, that will help to thicken the sauce, use very fresh cream or half-and-half rather than whole or low-fat milk, and thicken the cream with flour or corn starch to make a sauce rather than topping the ingredients ...

My sauce is watery

If you stored your potatoes in water to prevent discoloring, be sure to drain them well and pat them dry before adding to your casserole. Some of the waxier potatoes can release more water than starchier ones, so look for good baking potatoes like russet or Yukon golds.

Instant potato flakes are an excellent thickening agent made from real potatoes that have been cooked, mashed, and then dried. When added to watery scalloped potatoes, they absorb excess moisture and thicken the sauce, improving the overall consistency.

Potatoes or rice can remain rock-hard after prolonged cooking. Starch will not swell if it is acidic. If you have a lot of sour cream in your scalloped potatoes or add something acidic, your potatoes may not soften. You can cook the potatoes with heavy cream or milk and then, after they soften, stir in sour cream.

Method 3: Add starch or fat.

These ingredients not only prevent curdling, but they can fix it, too. You can heat heavy or whipping cream or make a simple roux. Gradually whisk into your curdled sauce to save it. If all else fails, there's nothing left to do but start again.

Starches like flour or cornstarch help stabilize the milk emulsion. This will prevent it from separating. A common technique is to thicken your sauce or soup with roux before adding the milk. This changes the makeup of the liquid and prevents curdling.

If raw, once the potato is cut you can store in the refrigerator, covered with water for 12-24 hours. Be sure to keep submerged in water to prevent slices from turning gray or brown.

Once you've chosen the right potatoes, grab a sharp chef's knife (or a mandoline, if you have one) and carefully slice them as thinly and evenly as possible—ideally one-fourth to one-eighth-inch thick. Potatoes that are too thick or thin will bake up unevenly, and you want the layers to cook up tender.

Though the scalloped potatoes have already been cooked in the oven, so just need reheating, an oven will bring them up to temperature more evenly and also create a better 'au gratin' finish to the cheddar cheese layer on top.

Potatoes can retain moisture. To prevent this, drain the potatoes very well in a colander or pot. Allow all the steam to escape the potatoes before mixing them with the dressing and other ingredients. Steaming the potatoes instead of boiling them is a good way to ensure that excess moisture isn't trapped inside.

Why do my scalloped potatoes always curdle? ›

The curdling is caused by high heat, which is hard to avoid in an oven. So to keep the sauce together, tackle it before the dish goes in the oven. Instead of simply layering grated cheese and milk or cream with the potatoes, you need to make a smooth cheese sauce.

Watery scalloped potatoes are not good, and is often caused by using the wrong type of potato. This recipe requires starchy potatoes, such as russets or Yukon golds, not waxy potatoes. Another cause is washing or holding the sliced potatoes in water (as outlined in the question above).

The difference comes down to cheese. Scalloped potato recipes are usually baked in a basic cream sauce until soft and tender, with no cheese topping. Potatoes au gratin are a bit more decadent. They are made with lots of cheese sprinkled in between the layers of potatoes and also on top of the casserole.

Do I have to blanch my potatoes, to make scalloped potatoes ahead of time? A: The short answer I recommend is yes, almost always. If sliced and then placed into a pot of cold water, bring to a boil for 1-2 minutes till the slices have a rubbery consistency, this blanching will help stop the oxidation process.

The bain-marie provides gentle heat to emulsify the water and fats in the sauce without the risk of splitting or curdling. Pâtés and terrines are usually cooked in a bain-marie so that they cook thoroughly while remaining moist.

Add 1/4 cup boiling water to the curdled sauce, wisk gently, and repeat until sauce is smoothed out. Re-season and serve promptly. This isn't a 100% cure but if throwing out the sauce isn't an option then boiling hot water is the closest thing to a fix you can get. The sauce with milk turned into Curds and oil.