2. Drain the potatoes (you may use the same water to blanch the green beans, below), then plunge them into a large bowl filled with ice water to stop the cooking. When they're cool, drain again. Toss them in a large roasting pan with the olive oil and the garlic.
3. Preheat the oven to 500 degrees Fahrenheit. Roast the potatoes, tossing them occasionally, until completely tender and lightly browned, 15 to 20 minutes. Toss with the parsley, salt, and pepper, and serve.
"Water is your enemy in ice cream," says Jeni Britton Bauer, author of Jeni's Splendid Ice Creams at Home. "That's what turns into ice." She shares her tips for fighting the enemy when making ice cream at home.