Tā jiā de jiānbing shì xiànzuòxiànmài de, suǒyǐ tèbié xīnxiān.
Their jianbing is made and sold on the spot, so it's super fresh.
Tips
grammar
现 + verb + 现 + verb is a productive pattern meaning 'do X right now and immediately do Y'. Other examples: 现学现卖 (learn it and immediately use/teach it), 现用现取 (take only when needed).
culture
现做现卖 is a marketing virtue in Chinese food culture - implying nothing was prepped hours in advance or microwaved. You'll see the phrase on signage at street stalls and bakeries to attract customers.
