- Combine the garlic, raisins, and vinegar in a large bowl and let sit for 1 hour. 
- Grate the beets on the large holes of a box grater or cut into fine julienne. Yes, your hands will get stained, but the color fades quickly. 
- Remove the garlic from the raisins and discard. Add the beets, lemon juice, most of the parsley and mint (save the rest for finishing), and chile flakes. Season with 1 1/2 teaspoons salt and lots of black pepper and toss. Let it sit for about 5 minutes and then taste—the slaw should be tart, spicy, peppery, and sweet. Adjust the seasoning, if necessary, then add 1/4 cup olive oil. Toss and taste again. 
- To make pistachio butter: Process the pistachios in a food processor to get them as fine as possible. With the motor running, pour in the water, vinegar, and salt and process until smooth, scraping down the sides as needed. 
- Again with the motor running, drizzle in the olive oil. Taste and adjust with more salt or vinegar. Store in the fridge for up to 10 days. 
- To serve, spread a layer of pistachio butter onto each plate and top with the slaw. Finish with the reserved fresh herbs and a drizzle of olive oil.