Mushroom & Beef Burgers with Curried Yogurt Sauce

Ingredients

• 2 tbsp canola oil (divided)
• 4 cups button mushrooms (chopped)
• 1 small onion (finely chopped)
• 1 tsp cumin
• 1 tsp dried thyme
• 1 jalapeño pepper (seeded and minced (optional))
• Salt and pepper (to taste)
• 250 g extra-lean ground beef
• 1/2 cup bread crumbs
• 1 large egg (lightly beaten)
• 2 garlic cloves (minced)
• 1 tbsp grainy or Dijon mustard
• 1/2 cup low-fat plain yogurt
• 1 tsp curry powder