Steps
1. Preheat the oven to 375°F (190°C).
2. In a food processor, combine flour, butter, and salt until crumbly. Gradually add ice water until the dough comes together. Press into a tart pan.
3. Arrange beet, carrot, and onion slices in the crust.
4. In a bowl, whisk together milk, eggs, salt, and pepper. Pour over the vegetables.
5. Bake for 30-35 minutes until set and golden.
6. Let cool slightly, garnish with fresh herbs, slice, and serve.