Rustic Strawberry or Blueberry Tart

Ingredients

• 1 cup flour
• 1/4 cup vegetable oil
• 1 1/2 Tbsp cold water
• 1/4 tsp salt
• 1/8 tsp baking powder
• 1 cup fresh or frozen blueberries or sliced strawberries
• 1/4 cup sugar for blueberries OR 1/8 cup sugar for strawberries
• 1 tsp lemon juice
• 1/4 tsp cornstarch
• Pinch of salt
• OPTIONAL: 1/2 tsp cinnamon (for blueberries only)
• 1/2 Tbsp butter or margarine
• 2 tsp whipping cream, milk, or water
• Sparkling sugar, raw sugar, or decorator's sugar