Zhè dào cài zuòfǎ jiǎndān, wèidào quèshì yīliú de.
This dish is simple to make, yet the taste is first-rate.
Tips
usage
却是 is more literary than 但是. It highlights an unexpected contrast - 'surprisingly, it is...' Use 但是 for neutral contrast and 却是 for surprising or ironic contrast.