Lentil sweet potato soup

Name: lentil sweet potato soup
Cuisine: None

1 tbsp olive oil 3 cloves garlic 1 med onion 3 tsp curry powder 1 tsp fresh ginger root 1 fresh jalapeno pepper 1 cup dried lentils 2 sweet potatoes 2 can diced tomatoes 4 cups vegetable stock 1 tsp sea salt Optional: plain yogurt & fresh cilantro or parsley