Warming Asian Pear and Celeriac Soup - Subarashii Kudamono

Ingredients

• 1 Tbsp. butter
• 1 Tbsp. vegetable or canola oil
• 2 large shallots, thinly sliced
• 1 pound (1 large) celeriac, peeled and diced
• 2 large or 3 small fresh Subarashii Kudamono Asian Pears, peeled, cored and diced
• 1 tsp. chopped, fresh rosemary
• 1 quart chicken or vegetable stock, plus additional as needed to thin soup
• Salt and pepper
• 4 oz prosciutto, optional