Russet potatoes will produce crisper crusts and fluffier centers. Yukon Golds will be slightly less crisp and have creamier centers, with a darker color and deeper flavor. You can also use a mix of the two.
The potatoes should be cut into very large chunks, at least 2 to 3 inches or so. For medium-sized Yukon Golds, this means cutting them in half crosswise, then splitting each half again to make quarters. For larger Yukon Golds or russets, you can cut the potatoes into chunky sixths or eighths.
4 pounds russet or Yukon Gold potatoes, peeled and cut into quarters, sixths, or eighths
Storage instructions: To store this marinara sauce, let it cool until it reaches room temperature. Then store it in a sealed jar or food storage container and refrigerate for up to 3-4 days or freeze for up to 3 months.
2 tablespoons olive oil (or butter) or 1 of each
1/3 cup finely-diced white onion
4 cloves garlic, pressed or finely-minced
1/4 teaspoon crushed red pepper flakes
1 (28-ounce) can San Marzano whole tomatoes (with juices)
Make ahead: Freeze the remaining meatballs on the baking sheet until solid. Transfer to a zip-top bag and freeze for up to 3 months. To reheat, place frozen meatballs in marinara sauce. Cover and simmer over medium low heat, stirring frequently, until heated through, about 20 minutes.
Storage: Cooked meatballs can be stored in an airtight container in the refrigerator for up to 3 days or frozen for up to 3 months.
Ingredient/Equipment Variation: If you don’t have a food processor, use a chef’s knife to finely chop chunky stuffing.