TL;DR: The best vegetable soup starts with building flavour before you ever add the broth. Sauté your vegetables properly, cook the tomato paste, season in layers, and finish with acid. Those four simple chef techniques turn an ordinary vegetable soup into one you’ll make all winter long.

Our Italian-inspired Best Ever Vegetable soup is the perfect recipe. Packed with fresh vegetables, hearty beans, and fragrant herbs, this soup is a satisfying way to enjoy a bowl of goodness any time of year. The key to its rich flavour lies in starting with a blend of butter and olive oil, which simply carries the flavours from one vegetable to the next.  Although this can be a bit of a ‘clean out the fridge’ vegetable soup, more often than not we will specifically shop so we can make this delicious and addictive soup.

So good, it even gets requested for a ‘thermos lunch’!

What Makes This the Best Vegetable Soup Recipe?

The best vegetable soup is built with better technique: That’s something we say in our cooking classes all the time. You don’t need twenty-five ingredients to make something delicious. You need to know how to get the most flavour out of the ones you already have.

This recipe starts by slowly cooking onions, carrots and celery until they’re sweet and fragrant, in a combination of olive oil, and butter.  Then we toast the tomato paste before adding broth. That tiny extra step develops a richer, deeper flavour that makes people wonder what your secret ingredient is.

We also add vegetables in stages instead of dumping everything into the pot at once.  Giving each vegetable the right amount of cooking time means everything stays colourful and has its own texture instead of turning into one big bowl of mush.

Finally, we finish the soup with something bright. A squeeze of lemon or a splash of vinegar might sound small, but it wakes up every flavour in the pot.   If you’ve got it, a big rind of parmesan cheese here adds a lot of flavour and richness.  

The Science Behind Great Vegetable Soup

Every step in this recipe has a purpose. Once you understand why, you’ll never make vegetable soup the same way again.  Cook your onions longer than you think, in TWO fats (we’ve also started this soup with some bacon first too, for a THREE FAT flavour combination). 

Give your onions enough time, and fat, to soften really well, also known as ‘sweating’, so that they don’t bop on the top of your soup at the end, but rather the savoury flavour is incorporated throughout.  

Think of it as building the foundation of the soup.   Continue this practice with the carrots and celery.   

Tomato paste deserves its own moment.

Never stir tomato paste into broth right away.   Let it cook with the vegetables for a couple of minutes until it changes from bright red to a darker brick colour. That short cooking time removes the raw taste and creates rich savoury flavour.   Professional kitchens do this almost every time tomato paste is involved.

Season as you go.

One of the biggest mistakes we’ve sees in cooking classes is waiting until the very end to add salt.

Each ingredient absorbs seasoning differently. By seasoning in layers, every vegetable develops flavour as it cooks instead of relying on a last-minute sprinkle of salt.   Salt also draws the moisture out of each vegetable, again, so they incorporate, rather than float aimlessly throughout the soup.  

Finish with acid.

This is probably our favourite chef trick.   After simmering for thirty or forty minutes, flavours become mellow. A squeeze of fresh lemon juice or a splash of red wine vinegar brightens everything instantly.