Rhubarb & Mixed Berry Tart

Don't ask how much butter went into this tart! Our neighbors had given Liz some rhubarb that I meant to make into a sauce for her. She is the only one in the house that loves rhubarb. I didn't get around to the sauce but came across a recipe for this tart and decided to give it a try. Now we have more rhubarb fans in the house!