David Karp is a pomologist with UC Riverside and a freelance writer for the Los Angeles Times food section, where he writes the Market Watch column. This week he talks to Laura Avery about the Warren Pear. Al Courchesne, owner of Frog Hollow Farm in Northern California, will be bringing his coveted Warren Pears to the Santa Monica Farmers' Market on November 30 and December 7. This is a rare opportunity for Southern Californians to meet Farmer Al and to try this incredible variety of pear.