Beef Gyros (Slow Cooker or Instant Pot)

• 3 pounds beef chuck roast (, sliced into thin quarter inch strips)
• 3/4 teaspoon salt
• 1/2 teaspoon freshly ground black pepper
• 3 Tablespoons olive oil
• 2 1/2 teaspoons garlic powder
• 2 teaspoons dried oregano leaves
• 1 teaspoon ground cumin
• 1 teaspoon dried thyme
• 2 Tablespoons fresh lemon juice
• 5 soft pitas
• 5 lettuce leaves
• 1 cup cherry tomatoes (, halved)
• 1/4 of a red onion (thinly sliced)
• 1 English cucumber (, sliced, and then halved)
• 1 cup plain Greek yogurt
• 1 clove garlic (, finely minced)
• 1 Tablespoon fresh lemon juice
• 1 Tablespoon olive oil
• 1 teaspoon red wine vinegar
• 1 teaspoon dried dill weed
• salt and freshly ground black pepper (to taste)

Directions