It was the jalapeno all along. Yesterday the F.D.A. announced that after a three month investigation into a salmonella outbreak that has sickened at least 1,251 people in 43 states, officials have finally been able to match the bacteria strain to a single Mexican-grown jalapeno pepper handled by a small Texas produce shipper. Fresh tomatoes were previously believed to be the culprit, and an F.D.A. warning against certain tomato varieties has cost growers an estimated......