Sweet potato, chorizo and chioggia beet salad

Ingredients

• 2 large sweet potatoes
• olive oil
• 2 chioggia beets
• 1 red onion
• 2 garlic cloves
• 1/2 chorizo
• large handful of cherry tomatoes
• 2 limes
• dash of ginger syrup
• 1 teaspoon sambal of your choice (we've used this sambal)
• 1 teaspoon coriander seeds
• about 60 ml sunflower oil
• small handful of grated cheese
• 2 small heads of little gem or other lettuce of your choice
• pepper and salt to taste