Top Garden is a small, unassuming restaurant across the street from the Tewksbury Country Club. If you don’t live in the area, you probably wouldn’t know it exists. Owner Kevin Chu bought the place eight months ago and though he says business is fine, we have the place to ourselves on three visits. The space is clean, with cloth napkins in bright Easter egg pink, a TV playing the news, and not much else. It’s a trek for us, a group of Somervillians who could just as easily head to Chinatown, just 3 miles down the road. In Tewksbury, of course, the parking situation is infinitely less stressful. With the first tingly taste of the oily, spicy, and absolutely addictive chili-peanut vinaigrette, we know we’ve made the right decision.