Do not be afraid of the rhubarb in this recipe, you can skip it if you can't find it, you'll still have a delicious and savory strawberry galette. I like a lot this quick homemade cake, kind of rustic, the effort is little and the result is tasty and nice. In the summer, you can improvise and use any other fruit you like.
Here, the rhubarb balances the strawberry flavour, adding a bit of sour taste, and the pectin contained in it thickens the filling so that it stays firm.
I discovered rhubarb 3 years ago and since then I've combined it with strawberries, first in the strawberry and rhubarb jam, then in various cakes with strawberry fillings. I'd say that rhubarb is the perfect match for strawberries and the fact that they are both harvested at the same time of the year is not by accident. If you don't have rhubarb in the garden, you can find it now in the big stores, so don't be afraid of it and use it!
For the vegetarian version, you can make the dough from the fruit galette recipe, the one with oil, which you can find on my website. It must be as good as this.