Red Lentil, Peanut & Sweet Potato Soup

Ingredients

1 large sweet potato, peeled and diced

1-19 oz (540 mL) can diced tomatoes, with juice

1/3 cup (185 mL) split red lentils

1⁄4 cup (60 mL) chopped cilantro stems, saving leaves for garnish

1 jalapeño pepper, seeded and finely chopped

3 garlic cloves, crushed

1 Tbsp (15 mL) grated fresh ginger

4 cups (1 L) chicken or vegetable stock

1⁄4 cup (60 mL) peanut butter (optional)