Spinach Artichoke Burgers - Sutter Home Family Vineyards

Ingredients

• 1 10 oz package frozen spinach, thawed
• 2 oz softened cream cheese
• 1 T sour cream
• 1/4 t salt
• 1/8 t pepper
• 6 canned artichoke hearts in water
• 1/2 c sour cream
• 1/4 c mayonnaise
• 2 lbs ground sirloin
• 1 3/4 t salt
• 1/2 t pepper
• 2 sourdough baguettes, approximately 4″ x 3′ long
• 1/4 c softened butter
• 1/4 c freshly grated parmesean cheese
• 1/4 c vegetable oil, for the grill rack
• 2 plum tomatoes, sliced 1/4″ thick