Preheat the oven to 410º F (210º C).

In a medium-sized Pyrex bowl, combine the butter, oil, water, sugar, and salt.

Place bowl in the preheated oven for 15 minutes,until the butter is bubbling and brown around the edges.

Carefully remove the bowl from oven. Using an oven mit to hold the bowl, pour the flour into the butter mixture and stir until the dough comes together and forms a ball. d

Divide the dough into 6 equal pieces and transfer them to 6 5-inch tart pans (with removable bottoms)

When the dough is cool enough to handle, pat it into the pans and use your fingers to press it up the sides of the tart molds.

Prick the dough all over with the tines of a fork then place the tart pans on a baking sheet and bake in the oven for 15 minutes, or until the dough is golden brown.

Remove from the oven and set aside to cool.