Lamb Shawarma

Ingredients

• 2 teaspoons ground cumin
• 1/2 teaspoon dried oregano
• 2 garlic cloves, minced
• 3 tablespoons fresh lemon juice
• 1/4 cup extra-virgin olive oil
• Kosher salt
• 1 pound lamb shoulder, visible fat trimmed and meat thinly sliced
• 1 white onion, halved and cut into thin slivers
• 1/2 cup tahini, (sesame paste)
• 1/2 cup mayonnaise
• Hot sauce, lettuce, sliced tomatoes, rice and warmed pita , for serving