Heat the olive oil in a large saucepan set over a medium heat until hot. Add the shallot, scallion, garlic, and a pinch of salt, sweating for 6-7 minutes until softened.
Add the rice and cook for 2-3 minutes, stirring frequently, until translucent in appearance. Add the wine, bring to the boil, and then reduce to a simmer for a further 2 minutes.
Incorporate the hot broth by the ladleful, stirring and simmering until the rice has absorbed all the stock before adding the next ladle.
Continue in this fashion until the rice is tender to the bite and creamy, usually about 20-30 minutes. You may not need to use all the broth.
Meanwhile, cook the asparagus and fava beans in a large saucepan of salted boiling water until tender, about 3 minutes.
Drain well and refresh in a bowl of ice water. Drain again, pat dry, and cut the asparagus spears in half.
Once the rice is ready, stir in the heavy cream and Parmesan. Adjust seasoning to taste with salt and pepper.
Ladle into bowls and top with the asparagus, fava beans and chopped sun-dried tomatoes. Serve with lemon wedges on the side for squeezing over.
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