Crushed puy lentils with tahini and cumin

Name: Crushed puy lentils with tahini and cumin
Cuisine: Middle Eastern
Ingredients: 200g puy lentils; 30g unsalted butter; 2 tbsp olive oil, plus extra to finish; 3 garlic cloves, peeled and crushed; 1 tsp ground cumin; 3 medium tomatoes, cut into 1cm dice; 25g coriander leaves, chopped; 4 tbsp tahini paste; 2 tbsp lemon juice; Salt and black pepper; ½ small red onion, peeled and sliced very thin; 2 hard-boiled eggs, quartered