Healthy Lentil and Feta Frittata

Name: Healthy Lentil and Feta Frittata
Prep time: 10 min
Cook time: 25 min
Total time: 35 min
Cuisine: European, Caribbean, Latin American, American, German
Ingredients: 8 eggs; ½ cup low fat milk; 1 tablespoon extra virgin olive oil; 1 brown onion, thinly sliced; 400g can lentils, rinsed, drained; 310g jar roasted capsicum strips, drained (about 2/3 cup); 100g feta, crumbled; 2 tablespoons chives, chopped, plus extra to serve; 4 tomatoes, cut into wedges (use different colours and shapes if available); ½ red onion, thinly sliced; 3 tsp extra virgin olive oil; 1 tsp balsamic vinegar; ¼ cup small fresh basil leaves