Put the olive oil and butter into a large pot over a medium-high heat.
Add the vegetables and toss to coat them well with the fat; season with salt and pepper.
Add 1 cup of water and bring to the boil.
Lower the heat to a simmer, cover the pot, and cook until the vegetables are tender (about 20 minutes).
Meanwhile, make the Herb Butter by combining the soft butter and herbs together; season with some salt and pepper.