My typical healthy lunch is a salad with tomato, cucumber, maize, chickpea, shallot and garlic, covered in beer yeast, olive oil and a liiiittle bit of soy sauce. It’s very light to digest and if you make a huge bowl of it to keep in the fridge it takes a while to spoil.

Otherwise there’s the classic pan bagnat (=wet bread). A recipe that looks alright : https://www.marciatack.fr/recette-pan-bagnat-nicois/