Arugula and Halloumi Tartines on Sweet Potato "Toast"

Name: Arugula and Halloumi Tartines on Sweet Potato "Toast"
Prep time: 10 min
Cook time: 30 min
Total time: 40 min
Cuisine: European, Mediterranean
Ingredients: 2 medium sweet potatoes, scrubbed; extra virgin olive oil; kosher salt and black pepper; 1/3 cup packed basil leaves; 1/3 cup pistachios + extra for garnish; juice from 1/2 a lemon; 2 big handfuls of baby arugula (about 1/2 a 5 ounce package); 8 ounces halloumi