How do you want to ease into your holiday dinner? Ease of preparation and serving are high on my list. Here are three easy, delicious, impressive starters you can make in advance. A sweet potato "pizza", an astonishing mushroom mousse, a simple and pure parsnip soup. In this year of the Pandemic, I'm looking at things you can prepare for one or two - or for a big party if you can do it safely outdoors. Just multiply or divide the ingredients.