Analysts at Citigroup identified on Monday two restaurant stocks that could offer value to investors looking to invest in the group. The firm's Gregory Badishkanian initiated coverage of both Papa John's Int'l, Inc. PZZA 0.49% and Sonic Corporation SONC 0.59% with bullish ratings. Papa John's Badishkanian initiated coverage of Papa John's stock with a Buy rating and $90 price target. The pizza chain offers investors a differentiated concept through unique advertising campaigns and partnerships. This business model appears to be sustainable over the long term as the company gains market share and grows out its store count. While bears might argue the domestic promotional environment within the pizza restaurant is reason to avoid the stock, these fears are "overbaked" and represent an attractive entry point for longer-term investors. Read morePZZA: Price will break out the falling wedge and form some upside. $PZZA, Papa John's International, Inc. / D