1 tablespoon olive oil
1 large shallot, finely chopped
1 clove garlic, finely chopped
1 cup heavy cream
1/4 to 2/3 cup finely grated horseradish (see Cook's Note)
1 tablespoon chopped fresh dill
2 tablespoons lemon juice
Use the smaller amount of horseradish if you want just a hint of it, and the larger amount if you want a bold horseradish flavor.