Our wide-bladed sterling flatware knives require balance and an unwavering hand. Grandma’s tremors left her embarrassed as green peas tumbled across the white drawnwork linen.   I avoided serving peas to spare Grandma’s feelings, but gosh darn it, she loves ‘em.   Thank heavens for ingenuity, invention, and the United States Patent Office. Thank my lucky stars for Desha Breckenridge and his Lexington Herald, all the blessings of advertisements.   There, on page 3 of Sunday’s edition, The Safety Pea Knife for 25 cents. Funny lookin’ thing – a long slice removed from the knife blade the sides of the cut decked in scalloped edging.   Grandma’s peas march right up her dinner knife, little green soldiers side by each. For now, this does the trick, but if Grandma’s tremors worsen we’ll be back to airborne vegetables.   “What about puttin’ sorghum on the knife?” asks my son. Now there’s a thought — the wonders of engineering, but lordy, who wants green peas with syrup?