Potato-Fennel Gratin Recipe (2024)

FAQs

Why are my potatoes au gratin watery? ›

If your potatoes have turned watery, it's likely due to excess moisture, overcooking, or not draining them properly.

It is possible to pre-prepare the gratin up to 2 days ahead by simmering the potatoes and transferring them to the buttered baking dish, then refrigerating them until needed. You should cool and refrigerate the mixture as quickly as possible, and within 2 hours of cooking.

Garten recommends letting the gratin sit for 10 minutes before serving it hot. She also notes that the gratin can be cooked a day ahead and reheated at 350 degrees for 30 minutes, a helpful tip if you want to save some time on Thanksgiving or Christmas.

Surprisingly, aluminum foil is his secret weapon. After beautifully shingling the potatoes (he's got a genius trick for doing this quickly, too) he covers the dish in foil before hitting the oven.

If you find yourself faced with a soupy pan of potatoes, shake a few tablespoons of flakes into the sauce and mix them around with a fork or a small whisk. The flakes will soak up the extra liquid in a flash, and you can keep adding them until the sauce is at the proper thickness.

Thankfully, there's a simple and effective solution to this problem: Use instant potato flakes. Instant potato flakes are an excellent thickening agent made from real potatoes that have been cooked, mashed, and then dried.

What is the difference between au gratin potatoes and scalloped potatoes? Au Gratin potatoes contain cheese, whereas Scalloped Potatoes do not. Scalloped potatoes typically contain cream but can also contain flavorful stock instead of dairy.

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 ...

If raw, once the potato is cut you can store in the refrigerator, covered with water for 12-24 hours.

Martha makes scalloped potatoes ahead of time by partially cooking them in milk and holding them on the stove. When the rest of the food is being prepared, just take them out of the milk, layer them, and bake them.

Why did my potato gratin curdle? ›

But it can be frustrating when the creamy sauce and cheese separate or look curdled. The good news is that the dish tastes just fine, even when it looks a little strange. 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.

If your potatoes aren't cooked properly, they will have a slightly crisp or al dente texture. You want to be sure the dish cooks evenly, so rotate the dish in your oven halfway thru cooking and be sure to test for doneness in more than one spot, in case your oven heats unevenly.

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).

Instead, the IPC recommends refrigerating the slices in a large bowl of water with a tablespoon of white wine vinegar or lemon juice. Make sure the potatoes are completely submerged and don't store them beyond 24 hours. When you're ready to use them, drain the water and pat the potatoes dry.

Whisk a little cornstarch into the warm potatoes, only a teaspoon at a time, until the potatoes thicken to your liking. The potatoes must be warm. You can also use tapioca starch or potato starch, although most cooks are less likely to have those products on hand.

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.

Add a Thickening Agent

This is the most common way to thicken mashed potatoes. You can use what you have on hand: Flour, cornstarch, or powdered milk are all solid options that are probably already in your pantry. Potato flour and potato starch would work as well.

Soil or dirt has a lot to do with the solids content of the harvested potato. Potatoes grown in clay or very dense soil have a tendency to not be able to get rid of the moisture versus potatoes grown in sandy soil or volcanic soil; which is what Idaho soil is.