Mushroom Tarts(Tartaletas de champinion)

Assemble these supplies:

• 1/2 cup butter
• juice of 1/2 lemon
• 1/2 pound mushrooms, finely chopped

FOR THE SAUCE:

• 1/2 cup butter
• 1 tablespoon olive oil 
• 2 tablespoons flour 
• 1/2 teaspoon salt 
• 1 cup cold milk 
• 1/2 teaspoon curry powder
• parsley

Steps in preparation:
 
Melt the butter in a skillet with the lemon juice. Add the mushrooms and simmer about 5-8 minutes. In a separate small frying pan, prepare the sauce by melting the butter and oil. Add the flour and salt; stir with a wooden spoon until well blended. Remove from the heat and gradually stir in the milk until the mixture is smooth. Continue to stir over very low heat for some five minutes until smooth and thick. Add the curry powder and mix in the skillet with the mushrooms. Fill the tart shells, garnish with parsley and serve hot. MAKES 20 TARTS.