Pressure Cooker Lentil and Kale Soup

Ingredients

• 1 leek, thinly sliced
• 3 garlic cloves, chopped
• 1 tbsp (15 ml) olive oil
• 2 cups (300 g) sweet potatoes, peeled and cubed
• 1 cup (200 g) dried green lentils, rinsed and drained
• 4 oz (115 g) kale leaves, stems removed, chopped
• 5 cups (1.25 litres) vegetable broth
• 1 can (14 oz/398 ml) diced tomatoes
• 2 tbsp (30 ml) red wine vinegar