Indian-Spiced Lamb with Spinach Lentils, Salsa and Yogurt

Leg of Lamb:

• 1.5 kg lamb shoulder boneless, approx. 3 lbs, ask for lean piece
• 1/3 cup curry sauce store-bought; example Tikka Masala; any curry sauce can be used
• 1 tbsp olive oil
• 2 cloves garlic minced
• 1 " ginger fresh, peeled and finely grated
• 4 cups spinach approx. 5 oz, baby leaves or regular leaves torn bite size
• 1 gr. lentils 330 ml can, rinsed and drained
• 1/4 cucumber finely chopped
• 1/2 cup Greek yogurt thick
• 1 cup cherry tomato halved
• 1/2 small red onion finely sliced
• 1/2 tsp salt fine sea salt
• 1/2 tsp black pepper fresh ground